Hi @mron
There is no balance sensor in the washer. At least there's none shown in the [https://www.searspartsdirect.com/model/54fe9z95z6-000583/kenmore-elite-11045972400-washer-parts|parts list] for the washer.
Intermittent problems can be hard to find so perhaps try checking the connections between the MCU and the drive motor to see if they're all OK i.e. not loose, corroded etc.
Here's the [document|31976|tech sheet] for the washer that may also help. On p.8 it describes how to check the windings for the motor, just in case one winding is not within spec or is on the limit of what may be acceptable to the MCU.