I have also noticed over the course of a week or so my guardian bounds shift about a foot to the right. Front facing setup 6ft high 11ft apart. I also get the right touch tracking issues on occasion but can normally fix by restarting oculus services.
I really think they need to stop recommending 2 cams for experimental (diagonal) roomscale setups. Clearly it doesn't work nearly as good as it should for most people and officially endorsing this risks disappointing a lot of people on the Rift because of false advertising.
2 sensors in front and I have problems with the right controller too. This never happened too often, but somehow Eleven Table Tennis stress the right controller too much and it just goes crazy in about 20 minutes of playing. The fact that this is solvable just my restarting Oculus Home makes my think this is a just a software issue, I hope so. I'll do more test when the third sensor arrive next week.
My right controller's trigger is loud too... the rubber dampener seems to have moved just a few days after I got touch. I hope quality control is improved 😕