Your printer will not connect if it loses the Internet connection. So check on the connection.
If the above provided method does not fix the issue, ensure that you disable the Use Printer Offline option.
If your Brother MFC L2717DW printer struggles to connect to Wi-Fi, restart the printer. If the problem persists, try the below methods to fix it.
If the above provided method does not fix the issue, uninstall the Brother printer driver from your device and reinstall the latest version of the printer driver.
If lots of print jobs are in the queue, there is a chance of paper getting jammed. So, cancel the documents in the queue.
If your printer prints blank pages, make sure that you replace the toner cartridge. If the printer runs out of toner, it will result in printing blank pages.