Thanks a bunch for providing this screenshot, issue looks very familiar to what some other users have been dealing with.
First things first, if possible, I’d highly suggest upgrading your firmware to the latest / mass production one.
As for potentially fixing this issue, please refer to the instructions posted by me in this thread: RUT241 udhcp renew doesn't work - #4 by MatasR
Let me know if this fixes it, if not, reply here & also fill out the form so I know that further analysis and troubleshooting needs to be done.
Regards,
M.