I had the same thing until I changed the performance governor, see e.g. here:
[19.07] R7800 random reboots - Installing and Using OpenWrt - OpenWrt Forum
Is 19.07.9 out yet, as I can find the release but no announcement: https://downloads.openwrt.org/releases/19.07.9/targets/ar71xx/mikrotik/
Not yet...
In general, a new OpenWrt version isn't technically released until an official announcement is made.
The technicality is important because the build may not actually be complete. It is possible that images for some devices may not be ready, or maybe certain packages will not have finished building. There is also a small possibility that an issue may arise in the build process that causes the build to fail for some targets or packages.
Therefore, just wait until the official announcement is made (should be pretty soon -- usually just a few days after the build-bots start compiling/building a newly tagged stable release version).
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19.07.9 has been officially announced today
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