Frame Utilization up 88% with 14 SM

Hello, we have an ePMP 3000L with firmware 4.7.1-RC22

Normally the FU it is around 20-25% but lately it has risen to 88% with the same 14 SM

Could you guide me to know what is causing this.

Thks for you reply

i have 2 sector as you can see one with 22.72mb-tp and 27.8%fu 16sm and 2d with 42.52mb-tp and 26.7%fu 14sm the different is almos 50% all sm are almost the same in retramismtionin both AP lest than 25%

The FU is less in the in the AP with more TP??