There could be many reasons that your brother's watch is resetting. The battery may need to be replaced. If it is a smart watch, it may need to have the software or firmware updated.
Battery.
because its screwed up
you probably used it too much, and the way to fix it is to remove the battery and put it back in.
Because they are.
You can keep an automatic watch moving by wearing it regularly to allow your movements to power the watch through the rotor. You can also use a watch winder to keep the watch running when not in use. Lastly, manual winding the watch periodically can also keep it moving.
They watch on the crew
you should check you computer for malware if your homepage keeps reseting after you set it.
Keep watch on.
it cleans itself by licking it
No
"Watch your back" means "Look out for what might be behind you." "I'll watch your back" means "Don't worry about what might be behind you, I'll take care of that."
He did background vocals for the Doobie Brothers on the song Minute by Minute "I Keep Holding On". http://www.youtube.com/watch?v=zpXK19Ik9z0&feature=related