RNS 810 with sluggish touchscreen

Hello together, for 8 weeks now I am the owner of a Phaeton 3.0 TDI year 2011. The first weeks did not go quite smoothly because I probably bought from the “wrong” dealer. After weeks the obvious improvements were finally made and I thought I had survived it it goes straight on. Since last week the door on the back of the driver’s side only opens from the inside. Here there are already some tips here in the forum. Although of course I am inclined I only have a normal VW-used car warranty, but it should cover it. I am much more disturbed by the RNA 810, the touchscreen often doesn’t respond at all. I can control most functions via voice input, but it is really annoying to have to deal with the radio all the time. Last week I even went into a radar trap known to me because I distracted by the unfunctioning touch. The workshop claims it is completely normal with the RNA 810 that it reacts hesitantly, this would be very dependent on the temperature in the interior. Unfortunately, I was also a bit hasty after the purchase and gave the RNA a firmware update and an SSD. This was done in a specialist workshop but I can’t rule out that the problem lies here of course. According to the running workshop, the update has nothing to do with it. robleme with the RNS 810 or am I an isolated case? Oh yes, the transmitters also lose themselves relatively often. Can I adjust immediately via the voice control. Sometimes it remains stored, but sometimes it is gone after 500 meters. According to “Umbauer” this has to do with a defective board, which causes these problems. Incidentally, the guarantee does not apply to the RNS. An exchange could thus become very expensive. – Greetings from the Odenwald drummy