Something is up all over the internets. Massive windows updates today as well as Avast and malware updates. Facebook is acting wonky also. I can't even open up my avast antivirus program now. I hope it has not been corrupted.
Tuesday was the second Tuesday of the month and when Microsoft always releases it's cumulative & security updates. No surprises there.
That said you may be having other issues, especially if you AV is acting up. Might want to do a manual scan by pulling down malwarebytes and running a complete scan.