Technical Key fob not working

[the green vanper]

Not heard of this, but doorbells and weather stations can interfere with some vehicles. Know a guy who spent almost a grand trying to find out why his range rover wouldn't start.
But this only happened at his house.
Turns out a weather station he fitted on his house interfered with the immobiliser, once batteries removed from weather station sender unit all starting problems ceased. This usually happens on slightly older vehicles that run on the same bandwidth.

Yes, it's normal. Every equipment which has remote parts needs to communicate with it. The question is on which frequency. Information on which frequency operates the vehicle remote should be easy to find. Then you have to check other equipment in the surroundings.

You probably have not heard about it, but the 2,4 GHz wifi has the same frequency as a... microvawe owen Don't ask how I know about it

 

[RalphM]

The frequency for the unlocking of doors key fobs is 433.92 mhz this is slap bang in the middle
of the most used part of that band and is a m.o.d. frequency shared with ham radio, and they were
there first so who decided to put key fobs there I don't know, though early systems were sometimes
affected later ones don't seem to be, likely due to better filtering.
The long coil type thing in the narrow part of your fob is the transponder for the ignition and if it starts
with that key it is working, if it's just the door unlock bit that isn't and the light in the fob is working then
it could just have got out of sync but I don't know how to re sync a fiat.