Funny answer... just not very helpful. Your problem is in the voltage.
The relay is driven by the amperage across it (that's why the flassh
speed changes when a bulb blows). You may have a bad switch on the
column, a bad flasher, or a corroded connection. To find this you will
need a DVM (digital voltmeter)

I'm assuming this is a 2 connection flasher, if not post a note and I
will modify the instructions for you

Here's the testing proceedure:
-First get your base voltage for the car from a known good location.
(lighter, fuse panel, battery, etc)
-Find the relay. Not sure where it is the buzz should lead you to it
easy though.
-Remove the flasher
-Turn on the hazard switch
-One of the wires in the flasher connector should show the same as your
base voltage for the car. remember this wire. (If neither do you have a
bad switch).
-Use a short wire to jumper the wires in the connector
-All hazard lights should be on and bright at this point. If any are
dimmer, check the connectors in that light for corrosion and/or clean
and replace the bulb. If they are all dimmer than they are with the
turn signal engaged or they are not on at all you probably have a bad
switch.
-If all the lights are functional and proper brightness your
relay(flasher) is bad replace it.

If you identify this as a switch. get access to the switch wiring and
check the switch resistance in both positions (it should be infinite
when off, and almost zero when on).

If you have no other luck, you'll have to voltage drop test at several
points along the system to find the biggest drop and ID the problem.

-Good luck,
-Mark