Created attachment 1256422 [details]
rhev-tlv thread dumps
Commit https://gerrit.ovirt.org/#/c/74034/ fixes the case of Quartz jobs disappearance which is a reasonable cause for the current bug.
(ALL please note that the reporter email is no longer valid - don't put needinfo on it)
This bug is most probably a dup of Bug 1429534 - I hope you can find more details there and probably even close dup it since we didn't see that behaviour for long time including last year scale-out which span 4.1 and 4.2 as well.
mperina if you don't have further comments I'll close dup it.
OK, it seems similar to BZ1429534. Feel free to reopen it reproduced again and attach new logs
*** This bug has been marked as a duplicate of bug 1429534 ***