I've had my TBolt sinc 4/8 and my 4G signal at work has been very stable until last night. I have to tether my laptop to my TBolt at work to get on the internet and last night we had another thunder storm and I couldn't get 4G for more than a couple of minutes at a time all night. 3G was solid though. Today is clear and sunny and my 4G signal seems to be back and working well. I will say that Verizon's 3G may not be a fast as the 4G, but it's still pretty quick and kept me connected to the internet when 4G headed to the storm cellar.
Ironic name for a phone that has the 4G scared out of it during thunder storms.