Any one using Virgin Mobile?

I just got a new iPhone 5s and Virgin Mobile Service. I'm in a "good" coverage area and it has worked well until this morning. I woke up and had absolutely no bars for over an hour. I now have 2 bars and can make calls. This is the only phone I have, I live alone, am older and have a medical condition that makes it very scary to have no ability to call someone for help.

Has anyone else had a problem like this? I want to make sure I get my money back within the 14 days if this is normal for Virgin Mobile.

Added (1). Got an email back from Virgin stating they were doing a "network vision" update and to give them a couple of days. About an hour later my service was restored and it has been fine since. Seems a little coincidental to me that I had absolutely no service until a complaint was lodged and all of a sudden an update solved it for me but at least I have service now.

Virgin leases network capacity from other cellular service operators, and does not have a network of its own, so their network reliability depends in large part on who the underlying carrier is. In some cases, and with some plans, Virgin lets you pick which carrier to use for your network, and you can select the one you find provides better service, if you wish.