There were similar reports with the earlier upgrades/updates. Try to give it a couple of days and see if it settles down. Also you can try to reboot the device. That usually closes down various apps that may be running in the background
I'm also having this problem on top of the phone is now lagging between simple operations. I've had to restart several times because the phone will suddenly stopped reading my micro SD card. Takes 20 mins for it to recognize the cars when I reboot. Is that going to settle down too? This is the worst update I've had short only of the update that messed up text messaging for 2 months.