Why did the inner door of the stove shattered

possible blocked vent and it overheated

Yes you can, your best bet. Try to go to manufacture of your stove.
If they discontinued then try the web

Hi, it sounds like you put the door on yourself? The inner glass of my oven door (less than 1 year old) shattered when I put it in cleaning mode. We had to call a serviceman which fortunately was a part of the warranty we purchased and he said it could have been a microscopic fault in the glass, but he replaced it and it's been good to go. I've never heard of installing the door yourself for an oven, but even so, I just thought I would share our experience. It's a dangerous situation since it could shatter outwardly and hurt you or someone else so you might want to ask for a service person to come and look at it. Hope this helps!

Did you resolve your problem as my inner door just shattered and will need replacing? Do you know why yours broke?

Try espares. If the part is not listed, there is a section where you can leave your requirements and they will get back to you.

Unfortunatey, it happens quite frequently, there is no one reason for it to do so.
The only solution is to replace it.
Over a number of years use, the glass looses it's properties, and this is what can happen.

It isn't that tough to change the glass assembly. Most of the Frigidaire have 4 screws that hold the front of the door to the inner part- sandwiching the glass in between. It is only sold as a unit- 2 glass pieces, assembled with an aluminum frame. Call All brands Appliance parts at 508-587-7100 and they'll get the part out to you. (Tell them Greasy Wheels sent ya, they'll take good care of you.) The most common reason the glass breaks, is a scratch in the glass. Sometimes it's just a dragged pan, other times it's from cleaning it with a sharp instrument. Don't do that....

LONG AS YOU DONT RUN SELF CLEAN SHOULD BE OK

This is not a job you should do. Microwaves are dangerous things and can cause injury. An improperly fitted door will leak. A new door, installed and checked out by a technician is needed here The economics are beyond my area.

Yes the inner door glass is a replaceable part and the door will have to be disasembled but not replaced. I can help with sourcing any parts for you since you used a premium post.