Do you happen to know which version you were on before you updated to 1.3.8 ? A number of versions were released in rapid succession, so you may have skipped a version or two.
This is the version history of the package here:
Could you try testing 1.4.0 for me ? Instructions to manually install this are in this post:
It’s possible to downgrade back to 1.3.8 if necessary.
Keep in mind that the mounting issues are of an intermittent timing related nature (race condition) which means you would need to test it many times to get an idea of whether it works properly or not.