I've sent a small amount to bittrex and it successfully went through soon after.
Then I sent a big amount and still 8 hours later nothing arrived at bittrex. My wallet says Status: 110 confirmations

I can't work with my wallet. It's almost always in a 'Not Responding' status and it's only not frozen only for a few moments when staking the whole amount.
I select from the options most of the amount to reserve and not participate in staking and it suddenly unfreezes but unfortunately it's still trying to sync with the network
Always says (out of sync)
It says 4423 blocks remaining and it's stuck there. Yesterday I had the wallet opened for most of the day and it only went down from 4300 blocks remaining to 4200.
Then I closed the wallet and reopened it a minute later and it was back to block 4334. Closed and opened a few times since then and now I'm at 4423 blocks remaining.

I always had heavy cpu utilization since the latest wallet release when staking and my cpu would often throttle.
I always had my wallet staking and only had it occasionally closed for no more than a day until I've decided 2-3 weeks ago to stop staking and have my wallet closed.
At some point after my wallet start having a problem syncing with the network.

Firewall is not blocking the wallet btw. The wallet says 13 active connections with the network and just at this moment I noticed the remaining blocks are up to 4425 from 4423 it was 10 min ago.