This usually happens because kdenlive is not smart enough to deal with multiple types of files, especially different frequency.
If you take a 44.1khz audio track and then add a 48khz track, you will definitely get the pops and clicks.
Use a tool like audacity or similar to do two things, flatten the audio tracks to mono and at least make sure both tracks have the same frequency.
I recommend changing both to 44.1khz.
After Idid this and reimported the trac........
This seems to effect many other LG phones , specifically their keyboard app and basically makes your phone unusable where you cannot use the keyboard because that message keeps popping up and the keyboard will not load.
unfortunately lg keyboard has stopped solution:
1. Go to your settings and manage apps and find the LG Keyboard app:
2. Stop it from running, delete all data and clear all cache.
After the above you will probably find that your........