Collabora Online stopped working after upgrade firmware to 6.9.3 and newer

I`m currently using firmware 6.9.2 on my Readynas Pro4.

Welcome to ReadyNASOS 6.9.2

root@nas:~# uname -a
Linux nas 4.4.111.x86_64.1 #1 SMP Wed Jan 10 14:58:59 PST 2018 x86_64 GNU/Linux

Everything works fine. I have Owncloud with Collabora Online 6.0. But after upgrade  ReadyNAS firmware to newer version Collabora Online stopped working, for example:

Welcome to ReadyNASOS 6.9.3

root@nas:~# uname -a
Linux nas 4.4.116.x86_64.1 #1 SMP Mon Feb 19 21:53:18 PST 2018 x86_64 GNU/Linux

kit-12997-03183 2019-02-18 20:33:39.773365 [ loolkit ] ERR  Failed to symlink /proc/self/smaps. Memory stats will be missing. (ENOENT: No such file or directory)| kit/Kit.cpp:2386
kit-12963-13000 2019-02-18 20:33:40.345353 [ lokit_004 ] ERR  Failed to load: file:///user/docs/yyQwfaZmgLnJgbcY/Historia%20BitBay%202017.xlsx, error: loadComponentFromURL returned an empty reference| kit/Kit.cpp:1681
kit-12963-13000 2019-02-18 20:33:40.345545 [ lokit_004 ] ERR  Failed to get LoKitDocument instance for [file:///user/docs/yyQwfaZmgLnJgbcY/Historia%20BitBay%202017.xlsx].| kit/ChildSession.cpp:564
kit-12963-13000 2019-02-18 20:33:40.355356 [ lokit_004 ] WRN  Skipping unload on incomplete view.| kit/ChildSession.cpp:98
kit-12963-13000 2019-02-18 20:33:40.355542 [ lokit_004 ] ERR  No socket associated with WebSocketHandler 0x67593d0| ./net/WebSocketHandler.hpp:108
kit-12963-03183 2019-02-18 20:33:41.356874 [ loolkit ] WRN  Kit connection lost without exit arriving from wsd. Setting TerminationFlag| kit/Kit.cpp:2218

Welcome to ReadyNASOS 6.10.0
root@nas:~# uname -a
Linux nas 4.4.163.x86_64.1 #1 SMP Wed Mar 20 17:57:45 UTC 2019 x86_64 GNU/Linux

kit-06793-06724 2019-04-01 12:52:34.167577 [ loolkit ] ERR  Failed to symlink /proc/self/smaps. Memory stats will be missing. (ENOENT: No such file or directory)| kit/Kit.cpp:2390
kit-06750-06796 2019-04-01 12:52:34.771056 [ lokit_002 ] ERR  Failed to load: file:///user/docs/0T7drmCzapA9R9Dc/test.xlsx, error: loadComponentFromURL returned an empty reference| kit/Kit.cpp:1685
kit-06750-06796 2019-04-01 12:52:34.771248 [ lokit_002 ] ERR  Failed to get LoKitDocument instance for [file:///user/docs/0T7drmCzapA9R9Dc/test.xlsx].| kit/ChildSession.cpp:564
kit-06750-06796 2019-04-01 12:52:34.773256 [ lokit_002 ] WRN  Skipping unload on incomplete view.| kit/ChildSession.cpp:98
kit-06750-06796 2019-04-01 12:52:34.773421 [ lokit_002 ] ERR  No socket associated with WebSocketHandler 0x43e0390| ./net/WebSocketHandler.hpp:108
kit-06750-06724 2019-04-01 12:52:35.774830 [ loolkit ] WRN  Kit connection lost without exit arriving from wsd. Setting TerminationFlag| kit/Kit.cpp:2222

I tried restore NAS to factory defautls = the same result

I tried install Collabora in docker instead *. deb package = the same result

I tried different ReadyNAS device(for example RN102) = the same result

I think something has been changed in kernel between 6.9.2 and 6.9.3...

What else i can do to use latest firmware and have working Collabora Online?

Best Regards