Another trick: when you pay yourself, I mean using 2 wallets on the same device, put Zeus in persistent mode. That will keep LND service always active. If that function is not active, when you switch from Zeus to another app, to pay the invoice, it can go fast into offline mode and you will lose the sync.

I use Zeus with always active persistent mode if I know that in that day I will use it several times. It cost nothing, in terms of battery, but help a lot. Once I know I wil not use it anymore that day, I just force close the persietent mode (from app info - force close) and done. Soon we will have a small button in the persitent notification that you can shut down gracefully the service.