This coin is dead? My wallet stops syncing...

2018-May-23 10:52:02.022385 INFO    [95.*.*.*:33603 OUT] Sync data returned unknown top block: 66984 -> 77384 [10400 blocks
 (10 days) behind]
2018-May-23 10:52:02.022385 INFO    SYNCHRONIZATION started
2018-May-23 10:52:02.849214 WARNING Proof of work too weak for block c387ea97441355663f2b1c10a40f4532e7188c765e9f284a1cce342f0c
566e3a