Re: What’s changed with QC35's new Firmware 3.0.3?
firstname.lastname@example.org (I do not work for Bose)
Unfortunately this is a known hardware issue and there is no workaround. First discovered back in 2018. The symptom is you turn the unit off but it comes back on by itself. The problem is a hardware malfunction - the contacts in the on/off switch are slipping.
You only have two options:
1. There are instructions elsewhere here and in many other places online to show you with text and pictures and how to fix it yourself. Can't say 100% but everyone who has shared they have tried this option have had success.
2. You can call Bose and ask for an exchange. Unfortunately and officially your exchange is only free if it is under warranty (< 1 year). Otherwise they will offer an exchange for a somewhat high price. You can do the troubleshooting with them and then explain your unit is part of a much larger group of units with this known malfunction and ask for a free exchange. They will probably say no and so you need to keep calling back and possibly escalating and call them back until you finally get someone who will say that they will do it 'this one time'. People who have gone with this option have shared here that with patience and persistence, they finally found someone willing to do such an exchange. No guarantees. I exchanged my unit in Dec., 2018.