I was going to mention the iwlmvm module.
Which is where intel wifi power management is. A separate module? yes.
It seems it is stated somewhere in that thread.
But a few things to mention - theres a lot of stuff posted there that is either old … or likely too extreme for your issue.
See this related thread:
So … if I were you I would start with the antenna option:
(not disabling modern/faster standards)
/etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=8 # enable antenna aggregation
And if thats not good then also check disabling power saving:
/etc/modprobe.d/iwlmvm.conf
options iwlmvm power_scheme=1 # disable power saving, default=2
And then if it still doesnt work … you can try a few other things.