My Pre Plus was suddenly behaving oddly on both of my Touchstones. I replaced the battery and the condition continued. My next option was to replace the Touchstone-enabled back of my phone. I ordered from Treonauts and the back arrived very quickly. Did the swap out and the phone is now "behaving" on the Touchstone and not cycling through "charging" and not charging every 10 seconds (and making a sound each time it began to charge).