Basically I opened the info window in Winbox yesterday for the USB modem but today its not working in winbox, neither through terminal. Removing the USB modem did not help and I am not restarting the router. What can I do?

please tell me the RouterBOARD model name and the modem that you use. also which RouterOS version is running?
"info" command only works once the connection with the GSM operator is successful

I have the RB750UP running v6.21.1. Using the Huawei E3272 that only works as a ppp-client. Status is connected and I have an IP. Don't know if related but yesterday the LED on the modem said LTE (established) but Info window showed 3G.

EDIT: Ended up reseting the router because I really needed to know whether it was in 3G or LTE. It was locked into 3G. Still really weird that on the RB the E3272 LED is the same colour now but registered into LTE. With windows/mobile partner 3G was dark blue and LTE light blue/teal.

i have 951Ui-2HnD firmware 6.41 , and use 4g(com mode) modem
if i look modem info in winbox and my comp lost connect(comp reboot) then modem info write next: - "failure: Info command already running!" .
say me please how stop it with out reboot RB(lose connect to providers) ?
THX