tor stops boostrapping on Android

We've been seeing an issue intermittently on Orbot / Android for awhile now, on tor 0.4.2.x and 0.4.3.x as well. After running just fine for weeks and months even, tor will just stop bootstrapping. The process starts successfully, the control port is available, but nothing happens after that.

We have narrowed it down to some kind of corruption in the DataDirectory. If you change the path of that, it bootstraps fine. If you set it back to the original path, it is stuck again.

You can see more data and details on the DataDirectory state and control port events here: https://github.com/guardianproject/orbot/issues/285

I am trying to get an export of the non-bootstrapping DataDirectory so we can look at the contents of each file.

Otherwise, is there a known issue with this type of corruption / non-bootstrapping state?