Intermittent disconnection issue occurring on the router

Installing and Using OpenWrt Network and Wireless Configuration
1

I installed OpenWrt on my Xiaomi Mi Router 4A (R4AC) 100M Router, then added SQM and AdBlock Fast. However, as shown in the link I shared, in LoL, the game sometimes behaves like this, where I can briefly see the signals before they completely disappear, and then I reconnect. Additionally, I experience connection drops not only in games but also during general internet usage. These disconnections can last for about 15-20 seconds. The connection indicator doesn't disappear, meaning I technically still have a connection, but it seems incredibly slow.

  1. Would switching the modem to bridge mode solve the problem?
  2. My router's RAM usage fluctuates between 75-80%. Could this be the root cause of the issue?
    Link ->https://www.youtube.com/watch?v=Ke-qJcB5q2U
2

Likely you run out of memory for wifi alone. CPU is too weak to cut SQM, and also adblock adds some memory usage.
Examine Status/Logs/kernel log for out of memory process kill.

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3

I reset to defaults using the "Reset to Defaults" option, and only I am connected via cable, yet it is using 56% of RAM. Could there be a problem? Is it possible that I am using the wrong firmware?

4

it is possible you need a new device

https://openwrt.org/supported_devices/864_warning

5

Could using the old firmware reduce my RAM usage?

6

yes, it would.

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7

SQM is useless for slow CPU you have, just uninstall it.
adblock uses memory, remove largest list maybe
You can add zram-swap on v23 (not v24) to get some spare space and stop wifi access point from crashing.

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8

The reason I wanted to use this router is to use SQM. Is it possible to use SQM on this router in any way?

9

disable the adblocker and wifi, see what performance you get using wired internet with SQM.