Hello,
if i have to try and explain what the problem is, i would describe it as although you scroll down on the device, actually you get the page either up or down or randomly moving. Anyhow the scrolling on monitor does not definitely follow the gestures you do on the mouse.
I can see that there are already posts related to that topic on the internet. I will post also some of them:

https://support.logi.com/hc/en-001/c...olling-problem

https://answers.microsoft.com/en-us/...5-b82c709c238c

There is even a video in a language that i cannot understand:
https://www.youtube.com/watch?v=GM1QL2XwmHw

Well some of those posts refer to manually downloading a newer firmware version and doing some changes on OS level, but that concerns Windows as far as i could get it. I have no idea if a fix for that problem could be found for Linux. That is why i wrote that post.

For the ones interested in the mouse model, here is a command line output:
Does anybody have any experience with that? Any ideas or suggestions what might fix that weird behaviour?

Thanks!

If the firmware update utility requires windows and you don't have it, use someone's windows to update firmware.
Alternative is to install windows, or bring the hardware to repair shop and let them upgrade firmware for you.
I would not bother with that type of hardware personally, I think in EU we can return or exchange hardware in the shop with no additional cost.

A couple of months ago I switched from my g403 to a new mouse because of this problem. The issue is not related to software AFAIK. It's a bad wheel optical sensor. You can disassemble it (it's quite easy) and clean a little bit, but it's a temporary solution. I did this procedure twice per week for a half of a year.

Pardon my ignorance in advance: Is this for Slackware--current? Or a different version?

If you report it, maybe it'll be moved to linux hardware forum.
Because it's not a slackware specific problem, but..

At least it's sunday, and it's not some critical issue which requires immediate attention on friday night.
When friday's your day off, and some folks have nothing better to do and decide it's a good idea to cause panic on friday so you have to work on your day off.

Sunday chat about random hardware should be the least of our problems, when you look at all the other offtopic around here.

But generally I agree that the version should be specified, even though nothing can be done in either -current nor stable in case firmware on actual device is corrupt.

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Ah mice... those pesky lil' pests! I need a solid mouse, one that's very accurate and will actually last through considerable manhandling. Most of what I do depends on my mouse even considering how much I also use CLI and keyboard. Whether web surfing/researching, running DAW editing, or playing games my mice get a workout, as does my hand using them. I bought 2 Razer Death Adder mice thinking a gaming mouse would hold up better than my mid priced Logitech. I bought 2 (sequentially) because despite the fact that I loved the size and shape for hand comfort and health the scroll wheels, specifically the stupid plastic gears, broke down from vigorous use. So I went back to Logitech.

I don't buy the most expensive because I have no use for 55 buttons... 5 is more than adequate for my usage. So I bought first the highest priced simple model,. a G403 just like yours actually, and when it broke down I decided on a cheap model I could afford to replace regularly again mainly for the scroll wheel problems. That was until I read that SteelSeries had similar concerns and built very robust scrolling systems. Result? Best mouse I have ever owned, accurate, comfortable, and durable. A big plus is the Profiles button actually works in Linux so I can go from a super accelerated Desktop use on a large monitor to a very precise but no pesky acceleration for editing and gaming at a single click of a button so designed as to require intent. It is so good that I researched and migrated from libinput to evdev options in xorg.conf for fine tuning and recognition of all buttons and wheels in every application.

TLDR - Get a solid mouse with a reputation for durability and I would emphasize researching scrolling components because that seems to be where most breakdowns occur. Cheap plastic parts do exist even on mice costing 70+ dollars with great brand recognition. Avoid them.

My g403 works fine but I've updated the firmware via Win 10 and run Current. The scroll wheel is flimsy but I haven't had an issue with it yet. I've had the mouse for around 3 years now.

It is not current it is Slackware 14.2 with some updates - Kernel 4.4.153

Are there any other new details?

Does it work on other systems, live distributions, different laptops or desktops?
Have you upgraded the firmware using the windows upgrade utility, or not?

Asking this because sometimes the firmware inside the device is broken beyond repair, I have personally seen it happen.