I received a payment to my wallet on the andreas schildbach wallet for android and I'm not sure why but it appears to have stopped syncing. I've left it open for half an hour and the last blocks it received were yesterday... I've tried it on WiFi and data and got nowhere, has anyone come across this issue?
Problems with sync in this and some others Android based wallets could be in Android 8.0 version which have battery optimization and this is preventing some apps to sync. You can try to deactivate this option in Settings -> Special App Access and turn off this option for wallet.
Owner of this wallet is also say that he is working on fix for this issue in September 2018, and last wallet update was in December 21, 2018. Maybe he is fixed this problem, so check do you use the latest version.
https://github.com/bitcoin-wallet/bitcoin-wallet/issues/557