Nighthawk RAX30 disconnects all devices once a day

I'm having this same problem with the same router, on the latest firmware (V1.0.15.110_1), I've been troubleshooting for months. The disconnects last only a few seconds. That's long enough to disrupt services that need a continuous connection, and the fact that it happens once or twice a day means I can't safely do things in, say, an MMO where I could enter a time-restricted event only to be booted by the router for no reason.

So I returned the router and got a replacement. Didn't take long for the replacement router to do the EXACT SAME THING. Here's an example of a bunch of disconnects I recorded over the course of a few days:

[Internet connected] IP address: 172.117.151.165, Wednesday, October 21, 2026 12:54:53

[Internet disconnected] Wednesday, October 21, 2026 12:54:50

[Internet connected] IP address: 172.117.151.165, Tuesday, October 20, 2026 22:06:54

[Internet disconnected] Tuesday, October 20, 2026 22:06:52 ----

[Internet connected] IP address: 172.117.151.165, Tuesday, October 20, 2026 06:29:34

[Internet disconnected] Tuesday, October 20, 2026 06:29:30

[Internet connected] IP address: 172.117.151.165, Monday, October 19, 2026 17:20:20

[Internet disconnected] Monday, October 19, 2026 17:20:18

[Internet connected] IP address: 172.117.151.165, Monday, October 19, 2026 00:53:32

[Internet disconnected] Monday, October 19, 2026 00:53:29 --------

[Internet connected] IP address: 172.117.151.165, Sunday, October 18, 2026 10:05:33

[Internet disconnected] Sunday, October 18, 2026 10:05:31 -------

[Internet connected] IP address: 172.117.151.165, Saturday, October 17, 2026 19:17:34

[Internet disconnected] Saturday, October 17, 2026 19:17:32 -------

[Internet connected] IP address: 172.117.151.165, Saturday, October 17, 2026 04:29:32

[Internet disconnected] Saturday, October 17, 2026 04:29:30 --------

[Internet connected] IP address: 172.117.151.165, Friday, October 16, 2026 13:41:36

[Internet disconnected] Friday, October 16, 2026 13:41:33

There have been more every day but I stopped recording times, and the log has been wiped from power cycles, factory reset, replacing the whole damn router, etc., but rest assured the daily disconnects are still guaranteed to happen.

Several of the disconnects happened exactly 14:48 hours apart from each other. The ones that weren't exactly 14:48 apart were within 13-17 hours of a prior disconnect. I already went through a whole bunch of crap with Spectrum, a tech replaced wires and the modems, they checked the modem logs for all the disconnect times I recorded above and saw no irregularities at those times on their end. I connected a laptop directly to the modem and ran continuous ping for several hours around the time window another disconnect was supposed to happen, the modem's connection stayed stable. At this point it's looking like it's the router, and that it's a problem with all RAX30 routers.