Brave rewards missing from my wallet

In the month of April all rewards I’ve earned through ads are not redirected to my uphold account and now all those BAT is missing from my account. They are not credited into my uphold account. Previously it used to be around 5 BAT something and now they are down to 2.3 BAT. can i know what just happened here.
Dear @BraveTeam Please look into it and please give me back my missing rewards.