Try cable, sounds like a wfi user, and somehow signal look weak for a time, any interference or other wifi user you sharre bandwide with can effect this, i dount you have wifi for yourself, fo max network performance.

ps.
We dont have to tell you update PC with BIOS drivers and chipsetr drivers and lan card drivers or router firma ware, or check cable or wifi signal is not taht strong as you think, we have seen steam user is fare away and no in direct Line Of Sight to wifi router.

The hole point with have wifi with in 10 meter , then a cable can do same, and the longer away it is also open the door for interference, ( i live in armed concreat, i cant even get good signal outside own room.) so yes wifi is worst possible network solutions ever made.

good to check mails, and thats the best i have to say about it. rest is cons, gamers should not use this. ( you send so many pre packets., and latency matters into any server per packets, + you forgot other user from other side also use it, they have a lag to server issue all of them.

As fare as we know there will never be a wifi solution that can beat a patch or fiber cable.

Then i said we that mean other tech person that know something on network traffic.

If steam could ban wifi user they will have done so. worst network solution for any gamers in the global online sync with host and server, this is fact, problem is

Network media and type is many things, and its assume players know better, fact is they do not.