Why does the message Bad GPS Signal Health appear when RTK Fixed?

Hello
I’m using 2 CUAV C-RTK 9P as a DUAL
I finally checked RTK Fixed today. However, a Bad GPS Signal Health message is displayed. How can I solve this problem?
Thank you.

2022-04-20 11-29-03.bin (524.5 KB)

GNSS update rate is too low. Use less constellations. Analyze the .bin log file to make sure the GPS message rate is above 5Hz.

What is constellations?
The parameter I know is set to 5hz.
GPS_RATE_MS = 200
GPS_RATE_MS2 = 200
SR3_PARAMS = 5
SR4_PARAMS = 5