But not entirely.
Some bugs appeared from time-to-time, for example. Mostly transient and of so little real consequence that I didn't make a note of them and can't, therefore, now describe what they were particularly.
But then a week ago, something much more problematic started happening and hasn't really stopped: anything to do with Dolphin (the file manager) would go e x t r e m e l y … …. s l o w l y. To the point where the desktop would effectively hang for tens of seconds on end, with mouse-clicks doing nothing until suddenly doing everything at once. Copying a 1GB file to my file server became a 'start it and come back after dinner' affair.
I couldn't explain it, and still can't. All my PC's hard disks are solid state; the link to the file server is gigabit ethernet. Nothing is running out of space; all SSDs have been trimmed. There's neither rhyme nor reason to it, other than the fact that I have continued to apply updates to the OS as they've been produced (perhaps thereby introducing instability: constant updates are something I really need to get out of the habbit of doing!
I've put up with it for a week because I hoped it would resolve itself, but after a week, I thought it was time to bite the bullet and replace OpenSuse Leap 15 with something less problem-prone. The great distro hunt of 2019 therefore began!
In searching around for a suitable replacement for OpenSuse 15 (which, it turns out, has a bit of reputation for being a tad buggy), I made some brief notes from assorted test installs I performed onto a spare (and somewhat sacrificial!) laptop. I reproduce them now, verbatim:
One of the common themes there is KDE forever asking for a wifi password. That seems to be a widely known problem, too! Unfortunately, I couldn't really find a fix that applied to me in a live session, other than to 'save the password for all, unencrypted', which seems a bit of a blunderbus approach to things.
Anyway, long story short: none of these distros seemed perfect, but the least bad one, I think, is probably Debian Testing. Debian Stable is way too out-of-date, software-wise, for my tastes, but Testing is pretty much as up-to-date as you could ask for. Every piece of application software I require seems to be readily available in the standard repositories, too. It's KDE implementation is pretty vanilla and thus nicely customisable. Of course, it's essentially a Beta version of what will eventually be Debian 10 …and running beta-quality software is not exactly my cup of tea. But, reading around the place a bit, it seems that Debian Testing might be a good deal more stable than many other distros' stable releases!
This weekend, therefore, I shall be backing up my main PC with a bit of rsync magic and a spare USB drive and then wiping the lot and starting afresh with a brand new Debian Testing install. We'll see if this can make it to the middle of Summer, at least!