My Jura ENA3 is about a year old. In the last couple of months, the coffee has become very weak. I've cleaned it, changed filters, check for rocks in the burr grinders. I've also used different coffees and settings. But it still comes out very week (the standard setting is Strong). Is there anything I can do to fix this?

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check water temp,also clean the machine with clr and rinse well

I took the grinder apart and found to have to replace the two metal grinding tools (inside cone and outside ring.
The parts for it were quite cheap. Just get yourself a proper instruction how to do it and follow it religiously. There are marks left by Jura engineers to calibrate the grinder assembly. Changing the actual grinder bits inside does not alter these if put together in the same position. The calibration is essential for a decent taste. After 7 years I would recommend a full service anyway. This will not be cheap, but all seals get replaced or just the brewing unit and the machine will be physically cleaned inside. Only a clean machine will give a decent taste. And the usual cleaning and de-scaling you can do is not enough to maintain a squeaky clean machine over the period of a few 1000 cups of coffee.

Jura x7 coffee machines are older models in the coffee machine range. It may simply require a full system clean, using jura cleaning tablets, or more likely a service. Bean to cup machines should really be serviced every year to 18 months depending on usage.

We can put you in touch with a Jura engineer if you need one, contact me here Denby Dale Coffee

I've uploaded an instructional video on YouTube, but you can also purchase the VHS video cassette at Laura's Last Ditch on Etsy.

It's all plugged with 'lime scale'. That's the white stuff that builds up from hard water. Regular vinegar run through at least two cycles will clear it, then a couple with fresh water to rinse it. That will bring it back to normal flow!

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

I had the same problem, when I called their very helpful customer service, I was given these directions.
Take out the tray.
Inside the machine you can now see a flap hanging from the top.
Reach behind the flap, and you should feel a round object/filter. It has a little dimple sticking out in the middle.
Wipe the filter with a paper towel.
Put the machine back together, and voila you got your coffee brewing again.

Basing on personal experience (you can find more on Google probably), solutions are:

On percolated (filter) coffee machines:

Check water temp, if water temp is insufficient , most common is scale heating element , faulty element, faulty thermostat.
Check if water is dripping right at the center of the filter, if it is dripping on one side because the orifice is clogged, that can result in weak coffee.
Coffee blend not well distributed on filter basket.

On Espresso machines:

Check water temp, same as filter coffee machines (thermostat element, scale on heating chamber).
Ensure that coffee is filled correctly in the filter cup (fill at level), and well pressed.
Ensure that the coffee mixture that you are using is not too coarse, buy the apposite one for espresso.
Ensure that you are not leaving the machine brewing for a time that is too long, and Italian coffee cup is very small, approximately one regular shot.

On the hob moka pots (espresso, Moka and Bialetti type):

This are the trickiest ones, you need art and practice to get a good espresso with a Moka, but when you learn, the result is better than what you may get with an home electrical espresso maker.
The frame on the hob must be not too strong, and the mixture coarse but well pressed, with water at level tag, or you will get a weak coffee.
On Mokas a good strategy is keeping hob at minimum, and turning up the flame at top when coffee starts coming out.

French and turkish cafetieres:

Ensure that you put enough coffee, water hot enough, and that you left the infusion enough time to get a strong coffee.

Note: insufficient pressure and clogged lines on electric machines never give you a weak coffee, exactly the opposite.
Not pressed mixture always gives weak coffee, but too much pressed mixture may give you coffee with bad taste.

Pill clean your machine.
Take out the filter for this experiment
Try adjusting your grinder to the full course setting. You will have to make three or four cups before you see the results of the new setting.
If the flow comes back to normal and the light problem goes away the problem was your grinder was set too fine. Replace the filter and try a few more shots. If all the water leaked out of the filter the lights will come on one time until the filter is purged of air and you should be good to go.
If you still have the lights coming on you have some type of internal restriction a technician will have to clear it . We repair Jura Capresso.

Basing on personal experience (you can find more on Google probably), solutions are:

On percolated (filter) coffee machines:

Check water temp, if water temp is insufficient , most common is scale heating element , faulty element, faulty thermostat.
Check if water is dripping right at the center of the filter, if it is dripping on one side because the orifice is clogged, that can result in weak coffee.
Coffee blend not well distributed on filter basket.

On Espresso machines:

Check water temp, same as filter coffee machines (thermostat element, scale on heating chamber).
Ensure that coffee is filled correctly in the filter cup (fill at level), and well pressed.
Ensure that the coffee mixture that you are using is not too coarse, buy the apposite one for espresso.
Ensure that you are not leaving the machine brewing for a time that is too long, and Italian coffee cup is very small, approximately one regular shot.

On the hob moka pots (espresso, Moka and Bialetti type):

This are the trickiest ones, you need art and practice to get a good espresso with a Moka, but when you learn, the result is better than what you may get with an home electrical espresso maker.
The frame on the hob must be not too strong, and the mixture coarse but well pressed, with water at level tag, or you will get a weak coffee.
On Mokas a good strategy is keeping hob at minimum, and turning up the flame at top when coffee starts coming out.

French and turkish cafetieres:

Ensure that you put enough coffee, water hot enough, and that you left the infusion enough time to get a strong coffee.

Note: insufficient pressure and clogged lines on electric machines never give you a weak coffee, exactly the opposite.
Not pressed mixture always gives weak coffee, but too much pressed mixture may give you coffee with bad taste.