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ISP :

Hi to all , please help me

I bought a second hand Wireless Router TP-LINK MR200 Hardware Vers. 1 for Internet and for domotic use with Google Home due of multiple IP port.

Firmware Version:0.9.1 1.1 v004a.0 Build 160905 Rel.60037n Hardware Version:Archer MR200 v1 00000000 IMEI:867787020005066

and I noticed that in the night expecially, (I could see from my wifi smart lamps and plugs, that when are out of connection they blink) it loose connection with
the provider.

After I tried to reset it without any results
After again I tried to find a new version of firmware for this unit and I found one for my hardware version V1 (I don't know if V2 or V3 could damage or not the unit
but ok I use the V1 new firmware version)

Now version is after upgrade without any issue:

Firmware Version:0.9.1 1.2 v004a.0 Build 180502 Rel.53881n Hardware Version:Archer MR200 v1 00000000 IMEI:867787020005066


BUT THE SAME, last night I found all devices that blinked and I noticed from my smartphone connected to the wifi lan of the ARCHER MR200
that there is no INTERNET CONNECTION.

WHAT TO DO PLEASE, PLEASE HELP ME THANKS A LOT

PS: I know from the net that someone else had this problem, but the second ask is: If I give back this unit and buy a new one, could be possible to face the same problem (maybe after some days or months)?

BEST

Sullivan