Major sync issues with djay 2 for iPad

I am having MAJOR issues with the sync function. The sync NEVER stays locked and even without it on when the bpm’s are matched they quickly slip out of time. A fundamental problem when it comes to beat matching and mixing!!! I have invested a lot in a new I pad and the reeloop beat pad 2- all based on the DJay 2 app- and its just not working how it should. Frustrating is an understatement. I understand this was not a problem with the original DJay app, so why now? Please can you help?