Did you try to play in a train? With vibration slowly shifting the stones away from the board? Magnet is the solution in that case. Or in any case when you need to hold the board with your hand too(public transportation).
A tablet bit bigger as a phone, but for me stay in that category, doesn't have the charm of stones and wood either. (Not really the OP topic)
Bamboo is a good choice for keeping it in a good state, absolutely. Some still find it a bit too dark (and very hard)
Well best could be to own all different kind (even plastic to play in the pool) and organize some weiqi party!