You asked exactly the same question as this one a couple of months ago and the same person asked for additional information that should have been provided in the template then too but you never even responded. Phone saids"Sync target is locked" when trying to sync
If you search the forums "aborting API call" for you can see a few people have reported it but it just seems to go away again after a while which implies that for whatever reason the sync target temporarily isn't working - not sure if it is service related or to do with the sync target itself.
The log file data as requested on the support template still hasn't been provided to be able to help with anything further. The whole point of it is to prevent a pointless back and forth chain of messages or simply being ignored entirely.