SOURCE: SL100 static and bad FM reception
I have noticed various changes in my invehicle FM reception as well. There should be a external antenna that came with your car kit. This is precisely for these types of issues. It is designed to run along the windshield inside the car closest to the Cars radio antenna. It should plugin to the bottom of the cradle. Then tune it into a clean FM station (one that has no local station on it) and position the cradle and/or ext. antenna till you get the best reception in your vehicle. It could very well be that the antenna has come has loose on your car stereo backplane. You would probably notice decreased reception on regular AM/FM stations as well though.
Your wifi reception/functionality is a completely different animal and has no bearing on the FM transmitter in the car cradle. When your on wifi your not receiving signal from a sat. anymore just simply streaming internet audio like your computer.
Good luck.
SOURCE: problems with static
The process of installing the tint involves using some type of knives or x-acto knife. While installing the tint, the wiring embedded in the windshield gets cut, and the radio won't get proper signal thereafter. Your dealer probably owes you a new back windshield...I know, it happened to me...
SOURCE: Radio - 2003 Chrysler 300 M
A antenna issue would be all the time, not come and go, this is what I have learned from 100's of repairs, I would suggest you make sure the radio has a good ground to the chassis, a poor ground will cause these kinds of static issues.
SOURCE: Red Lights
Thoroughly check your antenna connection, be certain the plastic grommet is in place (and not cracked) between the bottom of the antenna adaptor stud and your antenna mount, and check for corrosion in and around your antenna connections. If using a fiberglass antenna, check for cracked outer insulation. If a whip, be sure the Allen screws are tight and the antenna is getting a good connection. If you have a base-loaded whip antenna (Wilson 2000) make sure the base coil plastic case isn't cracked. If you find anything wrong, invest in a new antenna. If all that checks out, buy a new 18 foot piece of coax (around $20, or get the best quality you can afford) and run it to the antenna. You may have skinned the coaxial shielded outer insulation somewhere in the uninstall/install process, it only takes one tiny break to cause problems. Be sure not to run the coax through the door jamb or a window where it WILL be pinched and cause trouble, take time to run it under the dash and out a permanent vent access or through the firewall.
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