When a phone loses touch
If a phone drops out, the table waits for it, and the host decides: wait for that player, or drop them and play on. Table settings say how long the table waits. A phone that drops out can come back and take its seat again.
If this phone keeps finding the host over Bluetooth but cannot connect, ask the host to turn Bluetooth off and on again; if that does not help, do the same on this phone.
If two phones have versions of the game that cannot play together, the older one is told to update it from Google Play.