I played MD recently again, including all the DLCs. It was not unstable or buggy at all. I played under Linux, but am not 100% certain anymore that I played the Linux version and not the Windows version via Proton. In any case, maybe something to test next time you play it.
There is only one DLC I'd call excellent though: A Criminal Past. The others sadly are not great. Desperate Measures might be included now, but is just missing content from the main story, suffering by it being not integrated properly and it saw clearly less design work. System Rift saw even less, it's made cheaply - but not not fun and at least a story of its own. And then there is A Criminal Past, better than some parts of the main game, the only one I'd absolutely recommend.
There is only one DLC I'd call excellent though: A Criminal Past. The others sadly are not great. Desperate Measures might be included now, but is just missing content from the main story, suffering by it being not integrated properly and it saw clearly less design work. System Rift saw even less, it's made cheaply - but not not fun and at least a story of its own. And then there is A Criminal Past, better than some parts of the main game, the only one I'd absolutely recommend.