I have an Invicta 8926 with the Seiko nh35a automatic 24 jewel movement that has started to lose about 5 minutes over 8 to 12 hours, it's about a year old and was my daily wear. Was very accurate, I bragged it up in a post here, now it's just too inaccurate to use. I'm thinking it may be magnetized, any thoughts. Was only $80 new, not planning on spending $$ on a service. Thanks.

Gary

demagnetize before you do anything else
the nh35 should be good for another 10 years
also check the rotor it might be loose or balance spring rubbing also check hands