Verizon launched its high-speed USB modems for its LTE (long-term evolution) network only a week ago, and already they’re having problems. PCWorld reports owners of the modems have discovered that there is serious handoff lag when the modems switch between LTE and the more widespread 3G network, resulting in the modem holding onto its 3G connection for a while after it has entered an LTE area.

Testers have found that the LTE network is living up to the hype, so far: it pulls down 20Mbps and uploads at 5Mbps, as long as the area is relatively uncrowded. But if you’re going to be moving from the comfort of your LTE-wired area, perhaps passing through a 3G-covered train tunnel, it looks like you might have a smidge of difficulty upon LTE reentry.

When the modems lose their LTE connection and pick up 3G, they don’t hop back onto LTE once they’re in range of the higher-speed connection. One user noted that unplugging the modem and plugging it back in helped it picked up the LTE connection again. Verizon spokesman Jeffrey Nelson claimed this wasn’t necessary, but said that it may take the modems up to two full minutes to get reacquainted with the LTE signal.

Going between LTE and 3G areas is admittedly not the direst of circumstances—you’re still on the Internet