If your wallet shows "Out of Sync" and "0 hour(s) behind" at the same time, as a temporary workaround you can create execoin.conf file, and put the following lines into it:

listen=0
connect=95.85.26.197
connect=107.170.240.30
connect=162.243.136.142
connect=128.199.233.179
connect=198.211.100.64
connect=192.241.152.198
connect=107.170.79.10
connect=37.139.3.206
connect=188.226.169.188
connect=107.170.227.175
connect=128.199.221.109
connect=107.170.227.176
connect=188.226.169.189
connect=192.241.128.215
connect=107.170.79.12
connect=107.170.12.174
connect=188.226.130.205
connect=95.85.39.247
connect=192.99.166.230
connect=192.99.166.231

These are all working nodes above.