Just got a new Hunter light and fan kit, now the bulbs are burning too soon. We replaced the light kit,so I think it's another problem. Had the voltage checked in the swiches. Don't know what else to do.

If this is on a multi circuit(2 Hots on opposite phases sharing a neutral), it could be a loose neutral.
You would need to check all connections in boxes of those 2 circuits. If it happens all over the house, it could be your Large incomming Neutral.