First is your firmware up to date? Did you by any chance do a firmware update via wi-Fi connection? If so there may have been an interruption. NEVER do firmware updates on anything via Wi-Fi only via very secure and dependable wired connection.
There does not seem to be a way of doing a total system reset on that unit, only getting settings back to default.
Since you have trouble getting to the Net, I would download the latest firmware on a USB stick, and update the firmware from that. If that does not do the trick, then I have nothing else to suggest.
I would say, that players are far from the optimal streaming devices, and should be a last resort. I regard disc players as just that.