watching my rb2011 temp increasing to 90c

this is the second time happening after upgrading to 6.41. (if its related). never happened before and i have this model (2011UAS-2HnD) 4 years.
i am setting up rbwaps to caps mode in ether10. after some in/outs of lan cable, ether10 is crashed, no led turned on, no connection to rbwap, and the temperature is increasing one by one.
a reboot is not enough. i have to unplug power to rb2011 to fix this issue. i am lucky i touch it and feel the heat otherwise maybe it will be burnt.
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happened third time. pluging/unpluging lan cable to ether 10 (setting up rbwaps to cap mode) crash the port. dont know why. i sent supout.