you can reproduce this issue:
1) activate the modbus tcp slave
2) setup a modbus tcp master with period = 5
3) setup a sender with period = 5
==> initially, the mqtt-message is an array of 3 (as expected) and is delivered every 5 sec
==> after some hours, the webui can no longer be accessed and the mqtt messages contain only an array of 2 (DataRX and DataTX, the "analog in" value is no longer transmitted)
This might be due to modbusd consuming too much virtual memory...