What makes a fail sfe go bad

[MaxxRunner]

What makes a failsfe go bad? I have been struggling with my throttle servo in my Maxx lately and today i went to the track and i couldn't even get the serv to react to any input at all it was all locked up. Due to the bright sunlight I couldn't see the failsafe lite flashing at all. Finally seen it and removed the fail safe and all was well for the rest of the day. So what makes a failsafe go bad for no apparent reason? Can they be repaired? It was a Venom model about 6mo. old.

 

[hb1111]

i've had 2 go bad on me both were dynamites total darkness nothing from the throttle i kind of gave up on failsafes for now but I'm told to go with the futaba one which is about 45.00 compared to 25.00

 

[SkyMaxx]

From someone who doesn't like nor use them...

Turning them on.