Currently it is not known issue.
Could you please specify your version of MQX? Did you made any modification in RTCS code?
From my point of view it looks like problem with DHCP or rather problem with memory pointers where your code rewrites your settings.
Could you please use wireshark for recording presented network traffic and place it here for analysis?
Also files with your project could be helpful for reproducing it on our side.
Have a great day,
RadekS
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