MAX Transit DUO SIM keeps resetting

I have 2 SIMS in SIM A slots, Modem 1 - SPRINT and Modem 2 Verizon. The Verizon connection is stable, but the SPRINT SIM keeps resetting. ANy suggestions for troubleshooting this issue? I already swapped the SIMs to the other modems to have SPRINT in Modem 2 and same problem. Thanks in advance!

Sep 27 08:52:44WAN: SPRINT disconnected in SIM slot A
Sep 27 08:50:39WAN: SPRINT connected to Sprint (48.140.30.35) in SIM slot AS
ep 27 08:49:16WAN: SPRINT SIM A changed, reloading SIM
Sep 27 08:49:07WAN: SPRINT disconnected in SIM slot A
Sep 27 08:47:10WAN: SPRINT connected to Sprint (48.141.233.223) in SIM slot A
Sep 27 08:45:46WAN: SPRINT SIM A changed, reloading SIM
Sep 27 08:45:38WAN: SPRINT disconnected in SIM slot A
Sep 27 08:43:40WAN: SPRINT connected to Sprint (48.138.134.109) in SIM slot A
Sep 27 08:42:16WAN: SPRINT SIM A changed, reloading SIM
Sep 27 08:42:07WAN: SPRINT disconnected in SIM slot A

I assume there is nothing in Slot B? If So set the modem to SIM A only to stop it trying to use any other SIM. The ‘SIM A changed, reloading SIM’ message suggests that the SIM might not be seated properly.

Pop it out, give the metal contacts on the SIM a wipe and put it back in again. Make sure you hear a positive click when you insert the SIM.