It sounds like the hydraulic lifts are bad. You might find leaking fluid coming from them. They don't last forever but its an easy fix. If you're handy with tools you can replace them yourself or just have the dealership do it.
I had one go bad and the entire trunk lid was heavy like yours on my S70 just a few weeks ago. Be aware that the trunk struts are different depending on if you have a spoiler on your trunk lid or not. In my case I bought one at a junk yard (pick-n-pull) for $10 and changed it out- sort of a pain as they are attached near the back seat in an area that is hard to reach and hard to see but it can be done. If you need instructions PM me. I think they are about $40 each form an online store.
Also, if they have been previously just *okay* but a little weak, a sudden cold snap can push them over the edge, when the gas isn't as active. My Saab's hatch uses similar units, and it's fine when it's warm - when it gets really cold, suddenly it's a guillotine.
On the S70 this is VERY easy to change. On each side of your back seats there is a bolster. That is the part of the rear seat that does NOT fold down. Just grab that and pull up and out. It will pop loose pretty easy. Behind it is a hole in the metal wall, that is jsut below the mount point for the strut. You can reach in that hold and unsnap the strut and resnap the new one in very easily.
I only learned this after I ruined two volvo trunk struts trying to get them in from the front.
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