Consul periodically fails on "No Cluster Leader"

I have a docker-compose with consul used for services communication (ReportPortal).

It's deployed on ubuntu, consul container has a mounted volume for data. It worked some time (few months) with no problem, but recently started failing periodically (once a 2-3 days) with "No cluster leader" error.

I've found a one-time solution:

• to stop all services (docker-compose stop);
• to delete all in consul data folder;
• to start all;

But I cannot find out the root cause.

PS: You can see the docker-compose yaml:

$ curl https://raw.githubusercontent.com/reportportal/reportportal/master/docker-compose.yml -o docker-compose.yml

PS2: I don't see any lack of resources on host.

I would very appreciate if you could help me :)

ReportPortal v5 is about to go STABLE. There will be no Consul in it.