What I meant was that the error appeared quickly, because it usually appears every 2-3 flights.
Description of problem: After the pad came out of sleep (around the time of descent, because I'm slowly getting ready to land) I used it normally without any problems. As soon as I approached the landing I used the button to Rescan Connected Controllers (I use one of the axes for brakes because I don't have pedals. This is how it looks in .ini files
[Axes]
PollInterval=10
RangeRepeatRate=10
0=AV,256,F,66387,66388,0,0 -{ TO SIM: AXIS_LEFT_BRAKE_SET, AXIS_RIGHT_BRAKE_SET }-
) and FSUIPC close itself. I'll try to test it a bit more and see if the situation repeats itself in the next flights.