Your MagSafe power adapter could require frequent reset because of an external problem: the electrical wiring in your home is substandard, and/or the power provided by your electrical company is sending "dirty" current out of your wall outlet and into your MagSafe adapter. This official Apple support document refers to this problem as "line noise issues".
This means that the alternating current (AC) is irregular, and the MagSafe adapter cannot handle it. The best way to test for this is to use your MagSafe adapter and your MacBook at another location, possibly in another neighborhood, in a house or business where the electrical wiring is newer. If the problem goes away, this is an indication that the electrical wiring and electrical service in your home are substandard.
Fixing this would of course be an expensive proposition, and involve the services of a professional electrical contractor to retrofit the electrical system in your home or business, or to install expensive power conditioning equipment.