Verizon, Thunderbolt, Network Connectivity

I have an HTC Thunderbolt and I've been having problems lately maintaining a connection to Verizon's broadband network. After reading a few comments on this, it would seem that the issue has to do with 3G/4G network availability (someone please correct me if I'm wrong). I found this suggestion:

Enter the following from your dial pad- *#*#4636#*#* 

Then open the phone information- scroll down and change from CDMA + LTE/EvDo auto to CDMA auto (PRL)

Well - this seems to have done the trick for me.