One thing that worked for me was to "restart" the maxisys. "power off" is not the same thing. A restart forces a file system check which can solve issues with failed updates and corrupted files.
I was having the issue of "update" closing the maxisys app, as well as I lost access to several vehicle apps.
Just in case you do not know, you can get to the "restart" by holding the power button for a second.