Drops in volume when I export the master

[cyrusyan]

Hello,
When I export the master it makes me small sound drops at points in the song. I assumed it was because my computer was broken but I lowered the quality to a minimum and it continues to happen to me practically with the same frequency of times in the song.
In fact, if I listen to a song from the program, it also happens to me, the same with short songs and with little.
I have a pretty clunky computer
Does anyone have any idea what could be happening and how I can fix it?
Thanks in advance

[♬ ♫ ♪ nΛve ♪ ♫ ♬]

Are you using any plugin in demo mode? could be...