the adapter has nothing to do with that.

Nothing.

is the headset the type that uses sealed cartridge bearings?
they aren't as "Sealed" as people want to believe... there's a good reason those "seals" are actually called "Dust Covers" by some bearing manufacturers....
some "Cartridge Bearings" come with next to no grease in them....
Do you wash the bike with lots of water?
just curious.

the bearings used in Cartridge bearing headsets use extra-TINY little steel balls.. they Increase Contact Pressures to the Extreme.. they are a convenience, not an advantage. Low Grade Races and Balls cause quicker degradation too.

Old Caged bearing headsets can outlast a bike, with a bi-yearly regrease.. some go for decades without a regrease.... most Cart. bearings go bad after a year of Cyclocross abuse, MTB abuse, frequent washings, or wet commuting.

i consider cart. bearings a fad, not a good upgrade.