TBS6909 SNR Signal Status Problem

Hi,
TBS6909 card SNR and Signal status starts to move after 25 minutes of launching CentOS 7 pc.
I haven't found a solution for a few days, I think there is a problem with the card source, the windows pc have the same problem snr and signal status remains unchanged and it shows wrong, please find a solution to it.
Thanks
http://51.15.148.168/files/tbs-6909-snr-signal-status.mp4
TBS6909 card SNR and Signal status starts to move after 25 minutes of launching CentOS 7 pc.
I haven't found a solution for a few days, I think there is a problem with the card source, the windows pc have the same problem snr and signal status remains unchanged and it shows wrong, please find a solution to it.
Thanks
http://51.15.148.168/files/tbs-6909-snr-signal-status.mp4