Long time 3g user with no problems. Took the 4g plan for the cost savings even though no 4g coverage in my area.
Strong signal. No problems there.
As soon as I installed the UML290 the problems started. Every day since installation, 2-4 disconnects per day. Verizon level 1 and 2 support have tried everything and am now awaiting a call from level 3 support.
Uninstalling and re-installing VZAccess Manager does nothing, nor does fiddling with the power managment of the USB ports.
Second issue is the VZAccess Manager's autoconnect feature. Worked great with my 3g modem, has NEVER worked with the UML290.