Hi and welcome to Digi Forums.
Is your device running the latest firmware version? If not, please upgrade it and see if the stability improves (or goes away): https://www.digi.com/support/productdetail?pid=5645&type=firmware
If you are still having issues, this will be better handled directly via our support at email@example.com . Please attached a show-techsupport log from your device, see details here: http://ftp1.digi.com/support/documentation/LR_QN04_show_tech_support.pdf
Digi Technical Support Engineer