@TimO , I just noticed a weird behavior - I've changed configuration for another binding and restarted it from the console but that killed mysensors binding:
2017-03-04 13:07:19.110 [INFO ] [el.core.internal.ModelRepositoryImpl] - Refreshing model 'demo.things'
2017-03-04 13:07:19.123 [ERROR] [col.serial.MySensorsSerialConnection] - Interrupted reset time wait
2017-03-04 13:07:19.124 [WARN ] [col.serial.MySensorsSerialConnection] - Skipping I_VERSION connection test, not recommended...
2017-03-04 13:07:19.125 [INFO ] [col.serial.MySensorsSerialConnection] - Successfully connected to MySensors Bridge.
2017-03-04 13:07:19.125 [WARN ] [col.serial.MySensorsSerialConnection] - Network Sanity Checker thread disabled from bridge configuration
2017-03-04 13:07:21.141 [ERROR] [col.serial.MySensorsSerialConnection] - Can't connect to serial port. Wrong port?
2017-03-04 13:07:21.149 [ERROR] [col.serial.MySensorsSerialConnection] - Failed connecting to bridge...next retry in 10 seconds (Retry No.:0)
2017-03-04 13:07:33.161 [ERROR] [col.serial.MySensorsSerialConnection] - Can't connect to serial port. Wrong port?
2017-03-04 13:07:33.163 [ERROR] [col.serial.MySensorsSerialConnection] - Failed connecting to bridge...next retry in 10 seconds (Retry No.:1)
Complete stop/start of OH is the only solution so far.