Sorry i meant the dallastemperature library!

i'm running 3.7.5 now without issues but had problems after a day with 3.7.2

my ide version is 1.6.9 and onewire version 2.3.2

You may want to check which version of the onewire library you are running. I was having exactly the same issue and fixed it by upgrading the onewire library from 2.7.2 (I think?) To the latest version.

It's been a few weeks now with no crashes.