Endless HMIPServer restarts

[Jacuo]

Hello !
I have a lot of errors
ct 25 10:56:04 homematic-raspi user.err monit[1739]: 'HMIPServer' failed protocol test [DEFAULT] at [localhost]:39292 [TCP/IP] -- Connection refused
Oct 25 10:56:04 homematic-raspi user.info monit[1739]: 'HMIPServer' trying to restart
Oct 25 10:56:04 homematic-raspi user.info monit[1739]: 'HMIPServer' restart: '/etc/init.d/S62HMServer restart'
Oct 25 10:56:12 homematic-raspi kern.info kernel: [145421.121020] eq3loop: eq3loop_write_master() return error: -14
Oct 25 10:56:12 homematic-raspi kern.err kernel: [145481.584653] eq3loop: eq3loop_write_master() mmd_hmip: not enough space in buffers. free space = 1, required space = 34
Oct 25 10:56:27 homematic-raspi kern.info kernel: [145481.584700] eq3loop: eq3loop_write_master() return error: -14
Oct 25 10:56:27 homematic-raspi kern.err kernel: [145496.007756] eq3loop: eq3loop_write_master() mmd_hmip: not enough space in buffers. free space = 1, required space = 11
Oct 25 10:56:29 homematic-raspi kern.info kernel: [145496.007795] eq3loop: eq3loop_write_master() return error: -14
Oct 25 10:56:29 homematic-raspi kern.err kernel: [145498.399803] eq3loop: eq3loop_write_master() mmd_hmip: not enough space in buffers. free space = 1, required space = 46
Oct 25 10:56:34 homematic-raspi user.err monit[1739]: 'HMIPServer' failed to restart (exit status -1) -- '/etc/init.d/S62HMServer restart': Program timed out -- Stopping HMIPServer: OK Starting HMIPServer: ...............
Oct 25 10:56:52 homematic-raspi user.info monit[1739]: 'HMIPServer' process is running after previous exec error (slow starting or manually recovered?)

and
in
hmserver.log

    ... 15 more                                                                                                                    

2022-10-24 15:40:53,511 io.vertx.core.impl.ContextImpl ERROR [vert.x-worker-thread-18] Unhandled exception
de.eq3.cbcs.legacy.communication.rpc.RpcIOException: java.net.ConnectException: Connection timed out (Connection timed out)
at de.eq3.cbcs.legacy.communication.rpc.internal.transport.http.HttpTransport.sendRequest(HttpTransport.java:110) ~[HMIPServer.jar:?]
at de.eq3.cbcs.legacy.communication.rpc.internal.rpc.RpcClient.sendRequest(RpcClient.java:94) ~[HMIPServer.jar:?]
at de.eq3.cbcs.legacy.communication.rpc.internal.rpc.RpcClient.invoke(RpcClient.java:82) ~[HMIPServer.jar:?]
at com.sun.proxy.$Proxy40.event(Unknown Source) ~[?:?]

022-10-25 09:29:52,471 de.eq3.cbcs.server.core.vertx.KeyServerWorker ERROR [vert.x-worker-thread-4] Missing key server configuration parameter (Network.Key) for mode: KEYSERVER_LOCAL
2022-10-25 09:29:55,579 de.eq3.cbcs.server.local.base.internal.LocalServerAdapterInitialization ERROR [vert.x-eventloop-thread-1] Error 'LOCAL_ADAPTER_NO_SUCH_PORT' while trying to open port '/dev/mmd_hmip':
de.eq3.cbcs.lib.commdevice.CommDeviceException: Exception while trying to open serial port. Check configured port '/dev/mmd_hmip'
at de.eq3.cbcs.lib.nrjavaserialdevice.SerialCommDevice.open(SerialCommDevice.java:103) ~[HMIPServer.jar:?]

Reboot helps but only for some time
What can be the cause ?
How can I investigate further ?

Thank you for help

Jacek