I have only had a new Canon TR7020a Printer a Short while.. The Printer is connected Wirelessly, it can be a hit & Miss connecting the signal (1) Should I get a USB Cord to connect permanently ?? (2) I don't know why but purchasing something online with Marks Work Warehouse, to Print Off the Receipt won't happen .. After following the prompts in the end Printer just disconnects , I have no problem Printing Off any other emails . Why is that ??