Rx 570 8gb stopped giving normal hashrate

The card is 1.5 years old. Upon buying it Ive changed the BIOS and used to get hashrate of 29 mh (never tried to squeeze all I can out of it) but recently started to receive low hashrate of maximum 24.5 if I squeeze it hard. You can see it in screenshots Im attaching here. Shall I try to change Bios again or its done and let it work as it is ?
Here amd-info on this card:


here how it works now:

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