Dear guys,
thanks for the hint with ctrl-T!
Ive tried to put the startventilate(); to the start of the loop- nothin changed.
Unfortunately startventilate(); should only run, if currentpage == '1', so i think we need the if- statement.
Ive checked the librarys and searched for delay / interrupts, but cant find anything, which could be the reason for the fault.
Do you have any other ideas?