Raising the temp like you did and gently swirling the yeast back up into suspension seems to work for a lot of people. It never worked for me, though.
Next time aerate more than you normally do and see if you notice any difference.
Primary/Secondary: #90 American IPA, #91 Brown Ale
Kegged: #89 California Common
Planned: Dusseldorf Altbier, American Wheat
I use secondaries!