Known issue as described in Sync 3.4.22200 - Feedback & Issues
Assuming you tried performing a Master Reset and the issue is still present after that, revert to older builds like 3.4.21265 (proven to be one of the most stable builds)
Known issue as described in Sync 3.4.22200 - Feedback & Issues
Assuming you tried performing a Master Reset and the issue is still present after that, revert to older builds like 3.4.21265 (proven to be one of the most stable builds)