This may be true... but this is short sighted thinking. People used to think that the universe was entirely static, too. Things do change, and your ISP could have issues now or in the future for any number of reasons. I'm not ready to implicate your ISP, but just saying that the past performance is not always an indicator of the current or future situation.
The ideal situation here is if we can positively determine if the problem is related to wifi only, or if it affects wired connections, too.
One thing to consider is the power adapter. It is plausible that when you stress the router, the power exceeds that of the power adapter. If the adapter is related here, there would be two possible reasons for this -- 1) a mismatched power adapter with a lower current capacity than the one the device shipped with or 2) the power adapter could be failing with bad caps or other. If you have another power adapter of equal or greater rating (same voltage, equal or higher current/wattage), that would be a worthwhile test.
I know, but it's too unlikely, even considering how lucky I've been lately. Everything's fine -> I buy a new router and flash OpenWRT -> Problems arise after a month with the router itself -> I 'fix' them, so new problems arise, more subtle this time.
Is it even possible? I didn't install any additional packages, at most there are three devices connected to the 2.4ghz hotspot, and none of them use the connection to the full extent (even the laptop doesn't), and one PC connected with a wire.
I'll try to find another adapter (the one I am using right now is the stock one that was shipped with the C6, its output is 12.0Vā 1.0A 12.0W), thank you for the suggestion.
I can also borrow a laptop with an ethernet port from one of my friends. When I do that, I'll run some more iperf tests.
Absolutely possible. It is possible that OpenWrt could use a bit more power than the stock firmware in general, but even more importantly is how much power is demanded during high bandwidth periods... although it shouldn't exceed the 12W rating (based on the internal power circuitry), it is always possible that the power adapter is marginal for whatever reason.
The thing is that the problem is random, it appears even when my mom isn't at home (only one wireless device connected, not actively used, no apps that demand bandwidth) and when I am occupying less than 30% (probably even less than that) of total available bandwidth (Discord and some game like Deep Rock Galactic shouldn't take more than 1 MByte/sec in total) but the lag was still there. Previously it was awful, I 'fixed' it by restarting the router a couple of times
And now it just comes back from time to time in a way that I can't even describe properly.
Anyway, I'll come back when I have anything worth sharing regarding this problem.
