I have a 2021 DHP spec is350. just hit 68k miles on it never had a problem till recent.

Occasionally but not every time i turn the car on i notice the AC settings have been reset as if battery disconnected. Doesn’t do it while driving. Have only noticed it when shifting to park.

Then while driving earlier this week i got a low power steering alert and the wheel got stiff, AC crashed and rebooted and then all was back to normal in a matter of about 5 seconds.

I just recently replaced the battery about 2 months ago, but i have an airlift suspension 3p kit & an underglow kit wired to the battery. don’t know if this could be causing a short. Please let me know your thoughts

 

I say start with the simple stuff first. Did you check to make sure the battery connections are tight? It almost sounds like a bad ground to me. That can cause all kinds of wonkiness like you're describing. Assuming the battery itself isn't bad

 

I had similar issues like this when the battery was weak, and voltage dropped below 10V when cranking to start. Usually the steering not automatically move when start / stop, HVAC reboot, and HVAC servo motor will stick. I also had similar issues when a replacement battery was undersized (CCA and AH was below what was required), because the brand was kind of sub-standard. The label said 500CCA but testing shows it was ard 250CCA.

Id imagine ur mods have fuses and the fuse would blow if there was a short? Also i'd check where the power for ur mods come from, if you tapped it from an accessory maybe wire it such it uses a relay from the battery triggered by the ACC.

 

If you car is parked outside; exposed to heavy snow & rain / worst gutter run-off, or driven in heavy rain/snow/salt....
And if you home/office where the car is located is near industrial area / seaside (exposed to elements)......
Time to check the battery connectors & battery for corrosion.