I'm sorry to hear that this is still happening, however, this is definitely the server rather than the software. This is something your hosting provider will need to continue to investigate to find the root cause. These things where it is repeatedly happen could be configuration, resource overload, backup malfunction, corrupt storage, etc... The fact that it is multiple tables is stating it is really something on the server side.
This is the resulting error of our software attempting to use the table after it crashed, not the cause of the crash.