Short shift and turn.
Navibot sr8855 after repair of FET tranzistors for brush have bad mooving - navigation.
From the beginning it worked well and after some time was problem in navigation.
It looks like that: move 20-30cm stop and go back about 3cm, turn 90st. and repeat.
Sometimes work good for 1 minute and then again fail to this state.
I try test mod and all sensors look fine, motors are OK too.