Sync target lock error on Android

[Puteroshi]

Joplin Version 2.3.4
Android Samsung Galaxy Tab S2 running Android V7.0
Sync-ing with Nextcloud on Cloudamo

I sync with another Android device and a Windows 10 PC and both those sync fine. The Samsung Tablet give the error below.
I first tried to sync yesterday and it did not work and tried again today. The errors have varied a little since yesterday. The PC still sync's fine to completion.

Thanks for your help.(from a non-techie)

09-06T10:03:34,20,"Synchronizer: ""Sync target lock error: syncLockGone. Original error was: PUT .resource/9c3ca763a4f3491d848414f12c5507be: An exception occurred while executing a query: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away (Exception Doctrine\DBAL\Exception\ConnectionLost) (500): <?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s=" h t t p : / / s a b r e d a v . o r g / n s ">
<s:exception>Doctrine\DBAL\Exception\ConnectionLost</s:exception>
<s:message>An exception occurred while executing a query: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away</s:message>
</d:error>
""

[roman_r_m]

@Puteroshi

MySQL server has gone away

You may want to clarify with cloudamo support where exactly it has gone and when it will be back.

[Daeraxa]

[Puteroshi]

So the problem has been there for the last 24 hours and now as if by magic, the SQL server has found its way home and all works as normal again.
Thanks for those that replied