Was this problem where if you left it off unpowered for a while, and plugged it back in, everything was fine - and then some time down the road it would deteriorate? I've had that problem ever since I got the Bolt+. I had it replaced (and that was a lovely experience when they charged my card $1200 to advance-ship and still couldn't do it right), and the replacement not only had the same issue, but also tends to pick up remote button presses twice when it is only pressed once.
I gave up dealing with support. I tried resoldering the cable connector as I heard it could have heat-related issues, and the Bolt+ runs hot, but that didn't help. Fortunately, it can go a couple months between needing to reboot it. A simple reboot, or just a short time unplugged, isn't enough though. I went through all the same steps - I still had a Premiere, and swapped them, and the problem followed the Bolt+, so it wasn't an input issue. Swapped cable cards around, etc. - the Bolt+ ALWAYS had the issue.
The Edge is going to have to prove to be a rock-solid device before I'll consider buying another TiVo, which is a shame.