so i have an Epiphone Les Paul PlusTop Pro FX, and i changed the strings and everything was good, and then i plugged in and i noticed that my guitar wasnt as loud as it was before. (I know this because i always kkep my volume knobs on my amp in the same spot) I also noticed that when i plllayed with distortion, the volume would get quieter and fuzzier and then back to normal.

Any ideas on the problem?
ive only had the guitar for 7 or 8 months.

Is the cable plugged in all the way and the volume and tone knobs turned up?