"Jetty request 5905542 failed: null" causes OH2 to freeze. Getting to be a real problem

It’s probably one of the memory leaks that was fixed in openHAB 2.4.0. You might also want to check if your openHAB is not continuously trying to install some non-existing addon which causes a lot of unnecessary load. See also [SOLVED] After upgrade to 2.4 stable I'm flooded with java.lang.IllegalStateException.