Installing version 1.2.10 has not solved the problem.
After the upgrade, everything continued to work until 20:22.
At 20:22, the system became unavailable for 30 minutes, after which it became available again on its own.
At 04:26 the same thing happened until 05:42.
Ditto at 06:27 to 08:43.
What I noticed, in the short time that I used this the integration, is that every day at 08:43 the system became available again.