I’ll respond to your entire post when i get some time, but i strongly encourage you to install the firmware and post processor described in this thread. It should fix the IHS problem that you are facing. Once 20.5 is released in a few weeks all users will be prompted to flash this firmware and use the updated post processor since it has been extremely effective at fixing the IHS problem. Link to thread: FIX: IHS Triggering Before Torch Touches Plate
The glitch that you refer to, did it happen after the computer was idle for a while. Could be that the computer fell asleep?