My reward sometimes increases and sometime decreases but it's not moving more than a particular value

Briefly describe your issue: sometimes my reward get decrease from 34 to 31 bat and again after some time it increases back to 34 bat and also it’s not increasing more than 34 and i am not getting more ads also

What Operating System and Brave version are you using (Menu --> About Brave)?
Version 1.25.70 Chromium: 91.0.4472.77 (Official Build) (64-bit)

**Is your browser wallet currently verified? (yes/no)**yes

What date did you verify your wallet? i don’t remember that but may be about 3 months ago

**Have you been able to successfully receive payments in the past?**yes

Are you using a VPN? (yes/no) no

**Are you in a supported region (see here for list of supported regions)?**yes

Does your device pass the SafteyNet check (Android only)? yes

Have you manually turned off Auto-contribute on all of your devices linked to Uphold?? yes