I have a 3055, which seems to be catorgorised as a 3050 which keeps going offline
I use a Mac, but it does the same for my wife who uses a microsoft machine.
I have reinstalled the printer software on my computer, then tried restarting the prnter, but a fault message came up on the printer screne: OXB026CB5E.
It showed this message for a while then the printer stayed switched on and would not switch off. So, i unplugged the machine and left it that way for 20 mins.
On reconecting the printer to the mains, i could print from my phone, which was suffering from the same problem (having worked initially), by not wirelessly from the Mac. I plugged the Mac back into the printer and it works.
So it appears to be a comunication problem between my Mac and the other MS computers
I will soon be admitted to to the local mental hospital if a solution can not be found, it's driving me MAD!!