That might be so, but I doubt that OP installed it of their own volition.
Can you say for sure their system won't break if they remove something that is at the very least indirectly involved in its management?

My guess is that the KDE package manager uses it as a backend?

As I said, manual updates/grades would probably be better on this hardware.

What should i do?

PackageKit is just a front-end - I would not expect it to be risky in the same way as removing apt/yum/etc might be, since one could just reinstall it with whatever tool they uninstalled it with?

As per Who uses PackageKit?, KDE's Apper doer use it, so if that is relied upon then removing it presumably isn't an option, but since pinguin20 says they've switched from Plasma to Cinnamon, they probably aren't using Apper any more?

In any case, a dry-run/simulation removal should highlight dependencies and allow a more informed choice on the matter.

But, if the issue is random freezes potentially caused by PackageKit doing automated updates, it would make most sense to first work out what is triggering PK to start in the first place, and maybe testing what happens if the packagekitd service is disabled, without actually uninstalling.

PackageKit is an add-on, not necessary to run any openSUSE system, but automatically started by default if installed. Plasma has enough to do. It doesn't need to be involved in package management. My brother was running Plasma on 15.3 and bothered by various things, including daily updates. I told him to uninstall it. Now he's happy. On openSUSE forums and mailing lists removing it and Apper is a common recommendation.

Can someone tell me where I can disconnect OM drive?

You disconnect the PC power cable, open the PC cover, and remove the power and signal cables from the rear of the OM drive. The signal cable may or may not have a tab latch to hold it fast. The power cable simply pulls away.

Not sure what you mean by "add-on"?
In any case, PackageKit is a "high level front-end for different package management systems". By default it's just a daemon which in turn relies on various fron-ends (GUI or TUI), two of which are Apper and Discover.
Whether it's optional or not is debatable - arguably, most software preinstalled on any distro is optional.

I'll take your word for it.
For the sake of clarification, you told him to uninstall what? Packagekit/Apper or Plasma?

However, the crucial bit of info (that I overlooked previously) is this IMO:
And, I'll repeat, IMHO OP's machine is suffering from overload, there's nothing wrong with it per se.

I think he told him to uninstall PackageKit, and in my case I decided to just disable it and mask it to make sure that this service is not loading again

What is IMO or IMHO? If the real problem is overload then how can I solve it?

https://en.wiktionary.org/wiki/IMHO
You have to know if you can upgrade your hardware (by adding RAM, faster SSD or better CPU or whatever), or install a lightweight distro or ....

I have installed several distros and all of them has same issue. If my current distro freezes again I will search for what you suggested. Sadly, for now, I don't have enough money to upgrade my computer, so there isn't much to do

have you tried memtest already?

Yes, no errors found

Sorry but I don't believe that.
Just try one more time: scrap the whole install, install AntiX instead.

1. If there are things running in the background you don't use, uninstall or disable them. sudo ps -A should give you many clues to what's been loaded. Top/htop show resource consumption. systemctl list-unit-files | grep service | egrep -v 'static|generated|disabled|masked' shows systemd's loaded/running tasks. Indexers can be a serious problem on a system short on resources.
2. If the system thinks it's supposed to be able to be accessing an OM drive that's bad, it can tie up resources. That can happen with a program that accessed files from an OM disc, and keeps a history of accesses, when there is no disc in the drive.
3. 4GB isn't a whole lot of RAM. Close programs when not using them, web browsers especially. Don't keep a lot of web browser tabs open at once. Avoid web sites whose pages don't have a fixed size or end, e.g. Facebook. I wouldn't call 4GB a shortage per se, but it is an amount that needs to be respected with common sense. When something of significant consequence must be swapped out, it's usually pretty noticeable as a pause or apparent freeze that lasts more than a second or two.

Did you disconnect the OM drive?

Don't forget post #5. Hardware issues are a common cause of freezing, which here seems all the more likely because different distros misbehave similarly.

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In my case when freeze issue happens the entire system gets frozen even keyboard and mouse. I tried the shortcut to kill X server and it didn't work, only REISUB

sudo ps -A gave me this: https://pastebin.com/bsQg8mmM

And systemctl list-unit-files | grep service | egrep -v 'static|generated|disabled|masked' this: https://pastebin.com/WNR1QA35