I am now on my second failed 230w power adapter, the first was covered under warranty, bought a second as a back up and now that one has failed, the first was less then a year old, the second was about 16 months, no abnormal usage, it stays connected at my desk and unplugged when not in use and for the second time it has just stopped working. Now I’ll have to spend more money for a third. Anyone else have this problem?