Collabora Online stopped working after upgrade firmware to 6.9.3 and newer

Yes, Collabora Online is updated to latest version

collaboraoffice6.0                           6.0.10.29-292                     amd64        Brand module for Collabora Office 6.0 -29

but on older version was the same.

So why after switch from 6.9.2 to 6.9.3 (rule od small step, Collabora stopped working?
This is the log:

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

and after back to 6.9.2 Collabora back to life.

I am in vicious circle. I cannot switch to latest OS6 firmware because Collabora stopped working BUT i cannot install latest ownCloud because 10.2.x doesn`t support PHP5.6 whitch i currently using. Sure, i can install PHP7.x in jessie but this is solution for very short time because ownCloud developers already said that PHP7.0 will be also no supported soon. The best way is install PHP7.3 but this require Apache 2.4, so i have to upgrade ReadyNAS firmware to 6.10.x ;)

So this is a big problem for me: have older OS6 and older ownCloud but working Collabora Online OR have latest firmware with latest ownCloud but without Collabora Online.

Best Regards.

Yes, Collabora is up-to-date (6.0.10.29-292) but on older version was the same.

So why after upgrade to 6.9.3 Collabora stopped working and after back to 6.9.2 back to life? Here is the problem.

This is a big problem for me. I cannot use latest OS6 firmware because Collabora doesn`t work. BUT i have to upgrade firmware because the latest ownCloud doesn`t support PHP5.6... The best way is install PHP7.3 for future owncloud releases but for that i need apache2.4.

Best Regards