I have U343 and have had all sorts of issues since it installed; however yesterday I had the problem of all timers being skipped and I could not even record the show I was watching. Got error 1281.
After doing the standard "unplug and plug", it started recording and I could now record a live show; except that PTAT was still not recording.
I called Dish and they transferred me to Tier 2 and they had me do a Partial System Reset. This "supposedly" will take care of the problem with the 1281. From what I was told, they are receiving a whole lot of calls about this issue and even the person I spoke to said they were worried as to what they'd find was wrong on their H3 when they got home.
The other problems I've had since U343 are the Bluetooth un-pairing every night, tiles on the guide not showing up, screen flashes black several times after start up, response from Joeys is very very slow and a couple of other things. CSR person told me that they were aware of all of these issues and that there was an update that is supposed to fix these coming "soon".
Lets see what happens tonight.