It certainly sounds like you're doing everything right so we're very sorry to hear this is going on with your shaver. We do want to assure you that this isn't the Braun quality you should be receiving from us and we'd like to restore your confidence in our name. We do want to share with you that we have been able to isolate the cause of this problem and have since implemented corrective measures to address it. We know it is important to you that all parts of your Series 7 shaver work correctly, for this reason, please send your Series 7 shaver to one of our authorized Service Centers who will be able to repair the Head Lock and return it to you in a timely manner. You can do this by visiting, https://www.service.braun.com/home.asp?rg=NA&c=US&l=GB&typ=ser or by giving us a call at (800) 272-8611.