HR and GPS issues since the 27.09 update

The wrist HR monitor always takes a minute or two to accurately report heart rate when I start an activity. Usually it under reports, but once it locks in it's fairly reliable with the exception of a few hiccups along the activity, but after the update the heart rate over reports by a lot after a few minutes into the activity. It jumps up to zone 5 and then moves erratically around 3 and 4 when I'm only doing a zone 1 or 2 intensity. It also appears to momentarily under reports pace at times when I'm holding a steady speed so that the average lap pace will change dramatically. I'm not seeing any erratic paths that correspond with that error when reviewing the activity that would indicate GPS dropout. I can't say for certain either problem is related to the update only that I've never noticed these particular problems before.