Right hand side indicator keeps fusing - Cars & Trucks

I would think its a flasher relay or switch problem, do the indicators work when used via the stalk switch ? if they do then I'd start with the hazard switch

http://www.trav4.net/turn_signal_light_circuit-901.html
https://fuse-box.info/toyota/toyota-rav4-xa30-2006-2012-fuses-and-relay

knowing the type of vehicle would be nice
nuts that keep coming loose indicate the hubs are side specific with left hand and right hand threads
if you have a left hand side hub on the right hand side or vica versa , that will be the reason
next check the rim stud area
square shouldered holes in aluminium wheels require a steel washer first and rims that are tapered at the studs require tapered nuts

must b electrical, check all fuses in fuse box, below steering wheel to the right, or under bonnet on left hand side

Check ground and 12v supply for all the affected bulbs. Check fuse with proper test light. Is there a separate relay for right and left lights?
If there is, try switching them.

check the earth wire near to the battery. and fuse box.

If the lamps and bulbs are ok I would initially suspect the hazard warning light switch, then the indicator switch, the multiway connectors and then the wiring.
There is generally only one fuse for the indicators and as one side is working it can be assumed power is reaching the indicator circuit.

did you change the battery ? wrong amps or voltage could do that sometimes. it's called reverse polarity.

GET A GOOD FUSE TESTER, TEST EACH FUSE. THERE ARE 2 FUSEBOXES. ONE UNDER THE HOOD & ONE IN THE DASH. ALL FUSES CAN BE TESTED WHILE STILL IN PLACE. THERE ARE TEST POINTS FACING OUT. TURN ON IGNITION SWITCH FOR THIS TEST. POWER ON 1 SIDE, BAD FUSE POWER ON BOTH SIDES, GOOD FUSE. POWER ON NEITHER SIDE, SPARE FUSE.

Indicator on right side rear flashes twice normal speed and the front right indicator does not flash