core: Modbus unavailable after timeout error from SyncWorker in HA Core 2021.7.1

The problem

I have made the adjustment to the new configuration file setup for modbus. Everything functions again. I am using, sensors, switches and climates.

But after a while the modbus connection gets lost and I have to restart HA to get it to work again.

Have tried with different timeout and delay without any changes to the problem.

What is version of Home Assistant Core has the issue?

core_2021.7.1

What was the last working version of Home Assistant Core?

core_2021.6.6

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Modbus

Link to integration documentation on our website

No response

Example YAML snippet

modbus:
  - name: hub1
    type: tcp
    host: 10.10.10.25
    port: 502
    timeout: 4
    
    climates:
      - name: Heru FTX
        address: 1
        data_type: int
        input_type: holding
        target_temp_register: 1 
        count: 1
        temp_step: 1
        max_temp: 22
        min_temp: 15
    switches:
      - name: Ventilation Overpressure
        address: 1
        write_type: coil
      - name: Ventilation Boost
        address: 2
        write_type: coil
      - name: Ventilation Away
        address: 3
        write_type: coil
    sensors:
      - name: FTX Uteluft
        input_type: input
        address: 1
        unit_of_measurement: "°C"
      - name: FTX Tilluft
        input_type: input
        address: 2
        unit_of_measurement: "°C"
      - name: FTX Frånluft
        input_type: input
        address: 3
        unit_of_measurement: "°C"
      - name: FTX Avluft
        input_type: input
        address: 4
        unit_of_measurement: "°C"
      - name: FTX Rotor
        input_type: input
        address: 6
        unit_of_measurement: "°C"
      - name: FTX Fläkt Tilluft
        input_type: input
        address: 24
        scan_interval: 5
        unit_of_measurement: "%"
      - name: FTX Fläkt Frånluft
        input_type: input
        address: 25
        scan_interval: 5
        unit_of_measurement: "%"

Anything in the logs that might be useful for us?

2021-07-09 17:51:48 DEBUG (SyncWorker_7) [pymodbus.client.sync] New Transaction state 'SENDING'
2021-07-09 17:51:53 DEBUG (SyncWorker_3) [pymodbus.client.sync] New Transaction state 'SENDING'
2021-07-09 17:51:57 ERROR (SyncWorker_3) [homeassistant.components.modbus.modbus] Pymodbus: Modbus Error: [Input/Output] Modbus Error: [Invalid Message] No response received, expected at least 8 bytes (0 received)
2021-07-09 17:52:01 ERROR (SyncWorker_7) [pymodbus.client.sync] Connection to (10.10.10.25, 502) failed: timed out
2021-07-09 17:52:01 DEBUG (SyncWorker_7) [homeassistant.components.modbus.modbus] Pymodbus: Modbus Error: [Connection] Failed to connect[ModbusTcpClient(10.10.10.25:502)]

Additional information

I tried to go back to core_2021.6.6 and then of course it works as long as i revert back to the old config files.