It's not really out of sync. Difficulty adjustment is a complete mess, so the current block has become so hard it will take a 'while' at current hashrate. Because the wallet hasn't seen a block for a long time, it thinks it's out of sync.

Big miner comes, mines 10 blocks at full speed in under a minute, emergency adjustment kicks in, makes next block way too hard, big miner runs away, normal miners get stuck with the hard block.
When someone eventually finds it the emergency adjustment adjust diff to nothing (been too long since last block), which immediately triggers a big miner to mine 10 blocks... rinse, repeat.

Result of this algorithm that was supposed to fix greedy miners:
- greedy miners get most of the blocks in no time at all
- baseline miners share the hard blocks
- coins won't move for several hours

Please fix..