4G USB modem periodic disconnect (tether or 3G mode)

I’m using an AR-300M with a Verizon 4G USB modem (U620L) and am able to establish an LTE connection using either “3G” mode or Tethering mode. Either seems to work for a few minutes, but then the connection drops. The router will attempt to re-establish the link with varying degrees of success. I’ve attached a log showing the tethered connection dropping and trying to re-establish.

I would appreciate any suggestions on how best to debug the issue.

Thank you in advance for any guidance.


Always try to use Tethering to try first. The connection of network should be maintained by the modem itself so I expect it should be stable.

What is the power source are you using? Can you use a stronger one.

I am not quite understand the reason actually.