Dawn has really hit the nail on the head. It’s truely upsetting n sad to have this happen bro ! I’m currently having to watch “like/same” situation in my newer five hive apiary. I lost 2 new season hives die-out from “mites” even after treatments. I won’t get into that issue here…
Hmmm, what neck/region of the world do you live in (as Dawn also asked)… Moving inside your basement might accelerate the problem if it’s mites. Just a thot. Also bringing the colony like that may give the hive/queen a wrong message n really start her laying really adding to the stress n limited resources of your struggling bees.
If your up here in the Northern Hemisphere n I’d guess you are ! Protect the hive (insulate n add moisture protection (new if the old is soaked). I’ve replaced the woodchips in one of my Moisture Quilts already this winter. Also make sure your bees have extra winter food (lots on here about that already) … I’ve had to add more on all my remaining colonies already.
Beekeeping is a learning experience n yes ! We will have losses at times. But the ups n pluses of this important venture are worth the challenges n sad events. I have four new Nucs ordered for this season 2017. I will replace my losses, add to my current apiary numbers, and try to get a swarm or so this new season n if not I’ll try to increase by the process of a “Split or two”.
Don’t get down in the Dumps bro … Just do your best n learn from it. Keep good records, study, interact with other beekeepers n get a good local mentor if you can. Stay positive sir.
Danny is my mentor … One of the best helps n encourager I have !
Happy Beekeeping n good luck,