Runes of Magic US / AU

I have found that certain addons cause it to crash more often. I don't remember which ones I removed.
Using too many portals will also overload the memory. I have heard that there is a thing called "memory bleed" that occurs and fills your RAM. Every time the game has to reload your video data, some of the old data remains. Eventually there isn't enough room and you're out. Anytime I portal to get to an instance, I exit the game and restart the client. If you are in an instance and the group isn't full, that's not so bad because you can restart the client and log right back where you were. That's particularly helpful with Goblin mines. If you crash running solo or a full party, you are out, but 2-5 members and log immediately back in to get right where you were.
Increasing your VRAM helps, in my experience, more that system RAM, but lots of both is a good thing. I have 2 linked video cards, 4gig of VRAM, and 32gig of DRAM. Even still I lose it on occasion.

having an Op computer for RoM actually hurts you more than just having a normal one seriously lol.

your Op comps are trying to run a game better and faster than it was ever designed to...

I still have a ten year old computer, with crap, crap, and more crap inside of it, and as many know, I can be logged in for weeks at a time never reclogging, and never crash.

sometimes my clients are a week old when I play lol.

Nothing wrong with your specs, the game should operate as well as ever.

Did you by chance change internet providers?

I find that hard resetting my router when I start to see increased crash frequency and/or lag helps a lot.
Also, limiting add-ons to only what I consider essential (you might try Vanilla RoM {no add-ons}) and see if that helps.

I find this happens to me a lot when I have Google chrome or Mozilla open at the same time as RoM. I used to use them to listen to music while farming and found that they make me crash a lot more frequently. Just a thought.