sir, kung palaging napupundi ang mga bulbs,please check for loose battery terminals. clean the terminals properly. tapos, lagyan ng grease.
when the battery is loose(even for a couple of seconds), a destructive 18v or more is applied to the bulbs or any other device connected to the the battery line
nawawalan ng regulation ang alternator which causes the voltage to go sky high. hope your problem will be solved by this tip. happy motoring!!