Today, my Nokia 920 Windows Phone 8 locked up on me again (see my prior blog post on the lock up issue).

However, after getting my phone restarted, my phone displayed the following error:

Error code 80048888
There is a problem with the certificate for {my mail domain}. Contact a support person on your service provider

I was able to resolve the issue by completely powering down my phone and restarting it. However, I found another post indicating that deleting and recreating your email account on your phone may also fix the issue.

I purchased my new Nokia 920 on Friday November 9, 2012. On Wednesday Nov 21st, my phone is locked up and I cannot use it. All that appears on the screen is the “Nokia” logo. I rechecked my charger cord, and tried different cables and outlets.

On my Samsung Galaxy II tablet, I had encountered a similar issue, and discovered that I needed to hold the power button in for 13-15 seconds. So, I tried that with my Nokia phone. But holding it in for more than 30 seconds did not fix the issue.

So off I went to the AT&T store where I purchased the phone. The sales rep was surprisingly quick with the solution, which worked. He held in both the Volume key (5) and the Power/Lock key (6) simultaneously, for a full minute. This does a soft reset of the phone.