The Brother MFC-L2700dw Offline issue is caused by a number of factors. Firstly, the printer can be in Sleep Mode. So, kindly switch the printer's sleep mode off and back on. Second, the router cut off its wireless connection. The wireless router disconnects from other devices as a result of a power surge. The Microsoft update for Windows 10 is last but not least. Driver and software issues for Brother printers can also be brought on by updates.