I had the same thing after not even using my device since the last full scan.
Time line as follows:
Full scan using malwarebytes and other scanners, no detections.
Had to leave without using device after full scans so turned off PC. Event viewer confirmed device not accessed until I returned a few days later.
Downloaded definition updates, disconnected PC and rescanned everything in full (i do a full scan every 3 or 4 days regardless of usage)
Now I had these detections like you, though PC remained unused since last full clear scan. No detections on any other AV.
CLI seemed to confirm false positive above.
So far no issues with my PC usage, though would be nice to hear more from Malwarebytes team.