I've long suspected eHRPD as one component of the problem, but just guessing on the little I know. Verizon really needs tons of data to see how strong of a correlation there is. If there is a correlation, it won't be a 1:1 correlation as the problem seems to be rather complex to diagnose. Partly ROM related, partly network related, it seems. Perhaps the result of multiple cascade streams.
BTW, while all of my reboots have been in a 3G area, all of my data connectivity lapses have been in a 4G area. eHRPD is found in both.