Downloads keep dropping to 0 only on Steam

[Valery Gerasimov]

Hi, so i reached a point where i can't play specific games anymore. Everytime there is an update, i have to waste a few days to get it downloaded and installed and sometimes it gives me an error and i have to start the entire process again.
Last night, i had to download the Pubg update. After hours and hours of downloading at 0 or slow speed, i got an error "disk write error" and now i have to download another 34gb again...
Cpu: i7 13700kf
1gb/s internet
ssd: samsung evo 970 1tb m2/ seagate m2 2tb. Windows installed on another ssd.

Basically downloads start at high sppeed, then they drop to 0, then they stay at low speed, 5-6mb and then they drop to 0 again and so on. Sometimes they stay at 0 unless i restart the download.
Is there any fix for this? Thank you!
What i tried:
-unchecking writting disk cache
-changing regions
-limiting download speeds
-linking the depotcache and downloading folder with Pick Link

Nothing works, and yes, this only happens on Steam.

[king julian]

Almost the same thing happening to me for the last couple of months, really starting to piss me off. Every time there's an update i have to uninstall and then reinstall the game because its 10x faster than updating it. For some reason for me, it will only be my disk downloading and it spikes up, and then goes down, and so on. if i pause and then unpause only my network will start downloading for about a second or two, then its right back to the disk.

[Iceira]

sense this is check "-unchecking writting disk cache"

then you have disk is busy issue to network issue into steam,. wifi check with cable
do not think you cant check with spare pc, same as proof its not steam and ISP if it work there.

and you need to get the 2 ways issue here you either confirm or busted yourself with own main pc issue.

and technicaly i dont care if you have a disk that start to fail or cable ito the disk is the issue.

and thats why you test with spare pc or friends laptop, you try to eliminate alot of things with double check

dont forget i seen things very diffrent 1 pc has a issue then 10 other work, im sure you can do same in the faulthy finding procedur. ( i see it as a unit has a issue )
and why it is so, you just clear steam and ISP and router then work on other pc. ( this matter in the narrow it down to my pc has a issue. )

remmeber we are not support here we are steam users.

[Elucidator]

unchecking the hardware property option 'Write Caching on the Device' disables your SSD's DRAM. Windows then sends data directly to the SSD's storage, which will be a slower process than writing to the SSDs DRAM and letting the SSD do the writing to storage.
DRAM is however usually just 4GB, so it doesn't matter much. It will just reach fullness and then slows down to the SSD's memory write speed.

Limiting DL speed also slows down the download.

Intel 13th gen K (and kf) have issues. https://www.xda-developers.com/intel-13th-gen-14th-gen-crashes/

Make sure you update the firmware of your SSD:
https://nascompares.com/news/samsung-990-pro-ssd-failures-updated-♥♥♥♥♥♥♥♥-response-replacements-more/
otherwise the SSD won't last long. (yes this too has problems)

... if you haven't updated the firmware of your hardware (motherboard, etc.) and drivers, do that first. Also update windows if that hasn't happened yet. (I assume you're on windows 11)

Once done with that, run chkdsk on the ssd to fix errors that may have happened before the update.
disable sysmain, indexing, tweak windows defender to not scan every file change (which slows down writing obviously)

If the encryption state is Software Level only, disable BitLocker Encryption. (because this slows down your SSD by a ton).
If its hardware level encryption (thus using its own processor, it doesn't matter that much, but still..)
You will need your bitlocker recovery keys for this, so store those on a usb flash drive or somewhere accessible at least.

Check your router if you have any; maybe it just doesn't like steam and slows it down on purpose (could be an ISP issue too).

good luck figuring out what causes the issues.