I have seen this issue before and I updated the sylink checkin from 1 (once) to 0 (unlimited):
1. smc -stop
2. copy sylink from SEPM (export communications file (change verifysignatures from 1 to 0)
3. Upload sylink to SERVER
4. Replace sylink.xml with file uploaded.
5. smc -start
You can also use the sylinkdrop tool.
Now updating to 0 does cause some performance worries. I would recommend updating to like 3 maybe.
Hope this helps!