Samsung Galaxy SII - Audio files (music, wav files, etc) get rebooted whenever I press the power but

[PCFC]

There's this really annoying problem (well I think it's a problem) whenever I listen to audio files (specifically wav files that I recorded for my lectures)...and whenever I press the power button to turn on the screen light (wile I'm listening to the file), the program (either Tape My Talk app or Google Music Play) restarts whatever file I'm listening to. Essentially, I'll get 40 minutes into my lecture, have someone interrupt me, and I'll press the power button to turn the screen on to pause the file...and I'll lose my place 40 mins in. It's extremely annoying and irritating when I'm studying. Am I doing anything wrong with my phone? Is there any way for me to fix those settings? Is that the default setting?

Thanks in advance!