To paraphrase your problem:
smallpoul:
My sketch is doing weird things. It uses the String class a lot.
Stop using the String class. It can cause memory corruption which can make your sketch do weird things.
To paraphrase your problem:
smallpoul:
My sketch is doing weird things. It uses the String class a lot.
Stop using the String class. It can cause memory corruption which can make your sketch do weird things.