System process running queries every 25 seconds against SQL 2012 Developer Edition

Question

While debugging a long running stored procedure I wanted to include SP:stmtStarting and SP:stmtCompleted.
I noticed that every 25 seconds I was getting multiple queries against every database on my local server like:
select table_id, item_guid, oplsn_fseqno, oplsn_bOffset, oplsn_slotid
from [dbname].[sys].[filetable_updates_random_number] with (readpast) order by table_id
From different sid's each time.
While searching I saw that sometimes this may had to do with always on availability or filestream support but this is not my case since I don't use any of these features. This is a single instance installation.
The following queries return no rows.
SELECT * FROM sys.filetables;
GO
SELECT * FROM sys.tables WHERE is_filetable = 1;
GO
@@version returns:
Microsoft SQL Server 2012 (SP1) - 11.0.3401.0 (X64)
Jan  9 2014 13:22:15
Copyright (c) Microsoft Corporation
Developer Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )
This may be useful but I also have SQL Server 2014 Developer Edition installed but also without always on availability / filestream enabled.

Answer 1

Not yet, believe it or not, I've been working with them for nearly a month to try to figure this out.  Basically, what we found with our servers is that it's fine until it hits max memory or close to it.  When it hits max memory there
should be the memory cleanup operations that occur, and when they start it just can't clean up the memory.  The memory cleanup operations just keep getting ran over and over which causes the high CPU to sit there even when users aren't on the system. 
Eventually performance degrades and then eventually the SQL Server service runs out of available memory and the service restarts / crashes.  We (Microsoft) thinks they narrowed it down to 1 thing which is that it's a UserStore_SchemaMgr clerk
which continues to grow and never shrinks.
Here are a few things to try first:
1) Make sure your databases are corruption free (do a DBCC CHECKDB) on all databases and make sure there is no corruption.  If there is then repair it and reboot the server.
2) Install this hotfix (I'm doing this tonight, so I don't know if this fixes it yet, I have to do this off hours) 
http://support2.microsoft.com/kb/2904100
3) If no corruption exists from #1, run this: DBCC MEMORYSTATUS.  (Change the query type to have the results output as text from the top toolbar)  Then do Edit, Find and search for UserStore_SchemaMgr. 
It's measured in KB, so you have to divide that number by 1024 for MB and 1024/1024 for GB.  In our case we have it going into the GB's.  I have a Windows 2008 R2 SQL Server that this runs at about 8 MB.  On our 2012 server it's running at
15 GB.
This is what we're trying to work on now.  If you don't mind, let me know what you find, because I've been spending a ton of time on this with them and I think it's a bug, however we are having a tough time finding it.
Thanks.