rekordbox engineers finally replicated this issue only when they enable rekordbox dvs duing using DDJ-RX.
They would like to advise all the affected customers to take the following measures.
Please disable rekordbox dvs to see if any difference is made?
If you need to use the dvs feature, please use 5.4.0 for the time being.
If you already uninstalled the 5.4.0, please download it from the link below.
Thank you for your kind cooperation.
CRM, Pioneer DJ