The APC has been in use for around 10 years. (Replaced over 4 years ago)
Powerline also over 10 years. (Replaced about 2 years ago)
The 7490 was complained about by Swisscom because of a poor line connection.
The technician replaced my telephone socket, but the Devolo DLAN that caused the whole thing was stuck next to it and ignored it.
I used to have Netgear Powerline, but DSL didn’t work with one model back then. But that was exchanged for a newer version without any problems.
The 7590 does not have G.Fast, but it is definitely more stable than the tested 7582 with G.Fast.
There should be software for the Devolos that should solve the problem.
Should set another operating mode with lower speeds.
Apparently these are only available upon request from Devolo.
I once asked.
Would a network decoupler be able to solve the problem.
Where can you get something like that to test?