EtherLite32 reconnecting issue

we have some automation script running on Etherlite32 ,this script open com port, read info and then stop, it takes no more than 2-3 mins, after 5-6 mins EtherLite32 wil be dead untill power off/on . When this issue happen, the status is “reconnecting” on device manager/standard realport device, ping works fine , verlog.exe can not get any info . you can not connect to any com port .

Any suggestion ?   any any log /message  to check?