UNI-T UT139S hangs/delay after each button pressed or mode changed / power on

[BigMaxTs]

Hi,
I own a UT139S for a year and mostly use it at home. Last time I took it to measure something I found it makes a delay after every button I press of mode change or power on. The delay is around -+11 seconds every time.
Teared it down and nothing looks suspicious to be honest. Replaced batteries and probes - same story.
Made a video to demonstrate this problem:

https://youtu.be/iIac8be_YOE

Any help or advice would be highly appreciated.
Thanks.

[indman]

Cheсk and replace resonator quartz.