Hello everyone, I have three TPLINK routers, 
AX72 PRO
AX55
C80 

My previous setup was a AX55 as main and C80 as Satellite and everything worked great, 
but then I bought a AX72 PRO, and the setup became AX72 PRO (main) and AX55 Satellite, the C80 is just in storage,

I use the AX55 connected with ethernet to my PC.
The problem is that after a couple of months of usage, during downloads in steam or other kinds of heavy loads the AX55 goes offline after a couple of minutes.
I have tested, the AX72 PRO stays online via cable or WIFI. 
I also recently bought a RE500XD to see if it stays online when the router goes offline, and it does. So clearly the problem is in the AX55.
The network is stable during day to day use but the second I download something from Steam, the Internet LED goes orange and it looses connection.
Is the AX72 PRO too powerful for the AX55? Especially during Steam downloads, do I need another AX72 or AX72 PRO?

Also when this happens the AX72 PRO has the AX55 as offline in the EasyMesh tab, and the AX55 has no access to the network lan or wan.

The problem didn't occur till recent, could it be a software update?

Some data:

AX72 PRO
Firmware Version
1.4.5 Build 20250928 rel.17568(4555)
Hardware Version
Archer AX72 Pro v1.0

AX55
Firmware Version
1.4.1 Build 20250821 rel.70686(4555)
Hardware Version
Archer AX55 v1.0