All mining rigs stop for a moment

Hello. I have had a problem for a long time, all machines stop digging for a while and start working again after a while. Hiveos does not display any error or miner. I use European pool from hiveos. Is that the problem
?
https://i.ibb.co/7nzktCQ/Screenshot-20210726-185507-Chrome.jpg

https://i.ibb.co/s596D55/Screenshot-20210726-190648-Chrome.jpg

you are pushing your cards too much just for a few more MHs. 70 degrees is much for me. i prefer cards to be like 50-60. Why dont you try setting core clock 1150 and core voltage 850. memory controller voltage should work with 800-850 also.