Tendermint Blockchain node fails to start

Tendermint based blockchain went down about once every 3 weeks, then once every 2 weeks, then once a week.

Sometimes it could restart itself, and sometimes it could not restart with such logs:
10:20AM INF Unlocking keyring
10:20AM INF starting ABCI with Tendermint
10:23AM INF Unlocking keyring
10:23AM INF starting ABCI with Tendermint
10:26AM INF Unlocking keyring
10:26AM INF starting ABCI with Tendermint
10:29AM INF Unlocking keyring
10:29AM INF starting ABCI with Tendermint
10:31AM INF Unlocking keyring
10:31AM INF starting ABCI with Tendermint
10:35AM INF Unlocking keyring
10:35AM INF starting ABCI with Tendermint
10:38AM INF Unlocking keyring
10:38AM INF starting ABCI with Tendermint
10:42AM INF Unlocking keyring
10:42AM INF starting ABCI with Tendermint
10:45AM INF Unlocking keyring
10:45AM INF starting ABCI with Tendermint

Only restarting the container or better restarting the server helps.

Now it’s also down, but even restarting the server doesn’t help anymore.

Server configuration:
DigitalOcean. 8 GB Memory / 4 AMD vCPUs / 160 GB Disk + 110 GB / AMS3 - Ubuntu 20.04 (LTS) x64

This node acts as the primary node to which the application backend sends requests. The other two nodes work correctly and do not crash.

  1. How to launch the first node that fell down?
  2. How can I fix the problem that it cannot restart itself when it crashes?
  3. How do I fix the cause of the blockchain crash?
  4. Is it possible to make one of the other nodes the master node?

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