@AlessandroG I have exactly the same problem, sometime the SIM card lost the signal and the only way to go online again is to reboot, if nobody at home to reboot you're cut out!

Firmware Version: 1.4.0 0.9.1 v0001.0 Build 210727 Rel.33453n

Hardware Version: Archer MR600 v2 00000002

@AlessandroG 

Hello Tks for answer

I will check my firmware and decide. how to proceed

I will define a automatic reboot every week and check the situation.

I will update you

Alessandro

@AlessandroG yeahhh, I done the same 6:30 in the morning, automatic reboot, but you don't know when the provider line is cut, If cut at 6h35 the problem persist until I reboot. I think this is TP-LINK router problem, I have a second router ( Cudy LT400 ), no problem after provider line cut, when the line is on also the router come again up without reboot, the cudy router problem is only 4G and not 4+G , the difference between 4 and 4+ is too much.

bought a new one, ( Tenda Routeur 4G09 AC1200 Bi-bande 4G + Mobile Routeur ) arrives tomorrow, let you know ;-)

@TP-Link Thank you, why this version of Firmware isn't on the Support download page? ( beta?)

I already check about new Firmware, but the router itself wrote "Your Firmware is up to date " and on the Download page tp-link the newest is Archer MR600(EU)_V2_210208


Done your Firmware update, wait for provider cut to let you know

Thank you

@TP-Link this Firmware see now the router Internet line offline, but not solve the problem, must reboot to have the Provider Line up and running.
Change it with another router, work fine ;-)