Sonata I45 (LF 2015+) :: When Left Turn Signal Turned On / Right Signal Will Blink

We have a 2015 Sonata 2.4 Sport that has developed an intermittent turn signal problem. When the left turn signal is turned on, the right signal will blink. When the right signal is turned on, nothing blinks. A new symptom that recently started is sometimes neither turn signal will turn on regardless of the position of the turn signal stalk. I managed to get the car to dealer #1 while the LEFT=RIGHT & RIGHT=NOTHING issue was happening but while troubleshooting it, they ran across an inactivated aftermarket alarm system that dealer #2 that sold me the car had installed. I guess the alarm they install is so cheap, it's not even worth removing if they are unsuccessful in upselling you at the time of purchase.

Since dealer #1 would not troubleshoot any further unless the alarm was removed, I retrieved the car and took it back to the original dealer #2 I bought it from. They removed the alarm and the turn signals started working again, however, this lasted about 2 weeks before the symptoms returned. I booked an appointment at the dealer #1 to bring the car in & half way during the drive there, the turn signals started working again. With nothing to show them, I didn't drop off the car. Now the problem is back. Since it tends to come and go, I have try and time when I can drop the car off so it's happening when they get it.