Yes, it does sound like a power issue. This is pretty common on the Pi given the massive variability of USB power sources. This page is a pretty good resource

Yes, it does sound like a power issue. This is pretty common on the Pi given the massive variability of USB power sources. This page is a pretty good resource for researching community reported "known working" Pi peripherals including power sources: http://elinux.org/RPi_VerifiedPeripherals http://elinux.org/RPi_VerifiedPeripherals