YOUKU YK1 - 21.02.1 firmware frequent reboots

Hi,
I'm using this router and this router with the YOUKU YK1 21.02.1 firmware but I'm experiencing frequent reboots, without any reason.

The 19.07 series of firmware do not cause problems of this kind.

Any clue on what can cause these frequent reboots? How can I troubleshoot?

Start by trying 21.02.2.

Thanks for the hint. I just did it. Let's see what happens.

I have two xiaomi-mini, only run them as AP point(same ssid, use 802.11r), Everyday will random reboots. very anoying

 cat /etc/os-release
NAME="OpenWrt"
VERSION="21.02.1"
ID="openwrt"
ID_LIKE="lede openwrt"
PRETTY_NAME="OpenWrt 21.02.1"
VERSION_ID="21.02.1"
HOME_URL="https://openwrt.org/"
BUG_URL="https://bugs.openwrt.org/"
SUPPORT_URL="https://forum.openwrt.org/"
BUILD_ID="r16325-88151b8303"
OPENWRT_BOARD="ramips/mt7620"
OPENWRT_ARCH="mipsel_24kc"
OPENWRT_TAINTS=""
OPENWRT_DEVICE_MANUFACTURER="OpenWrt"
OPENWRT_DEVICE_MANUFACTURER_URL="https://openwrt.org/"
OPENWRT_DEVICE_PRODUCT="Generic"
OPENWRT_DEVICE_REVISION="v0"
OPENWRT_RELEASE="OpenWrt 21.02.1 r16325-88151b8303"

I will try 19.07.9 to test.

19.07.9 is ok, never random reboots any more, very stable.