Ostrovsky

In the latest firmware, I found a problem. On any overdrive sound (effect or amplifier), there is a parallel sound like ring modulation. Very well heard in headphones on individual notes above 12 fret. 

I solved the problem. The reason was active trails on delay. Very strange

I got a click ( slight crackle) when switching presets. Firmware 2.80. It appeared on both Helix LT and Helix Stomp. On the previous firmware was not such. How to fix?

I only use my presets.

I have the same problem with loading on POD HD500X. Reinstall latest version flash memory helps temporarily. What technical support Line6 say about this? How can I fix this problem?