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you need to approach this methodically...
1. check the battery, see how old it is , and if had been drained down and then recharged - once drained, these batteries do not hold charge as they should
2. check the alternator's output, see if the alt has low or high output, or the output jumps up and down - once voltage regulator is gone, it will wreck a havoc on the system
the problem sounds like a chaffed wire that shorts somewhere, or as if an electronic component in some peripheral board is going south and shorts...
3. check known locations for bend wires - the trunk lid with two boots - pull the boots and inspect the wires... I had a short in rear wiper motor that killed the adaptive headlight movement...
4. check wires under rear seat - pull the seat up and look in the area of the door jambs, there spots where wire bundles traverse over a sharp metal edge.
5. check fuse in the glove compartment, especially the ones for the front wiper, the rain and/or light sensors - use a meter to check fuses - if you have patience, check every fuse with a meter
to save money, you have to do this chase of the short yourself, otherwise, you will be paying hours and hours of labor to somebody to do these relative simple things...
if you can, try to catch the moment where the problem manifests itself - maybe you would be able to correlate the external event with the problem...
tell us what you find...
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