My Echo Audiofire4 has latency and after 5- 10 min there would be this crunchy sound - anyone with that kind of experiences?

Im thinking of switching to Steinberg UR44 but is that the best soundcard to work with BIAB and Logic pro X?


iMac - Yosemite 10.10.1 - processor 3,4 GHz intel Core 5 - 16 GB Ram.
Steinberg UR44 lydkort
Supreme TU-97 Kondensator mikrofon
M-Audio KeyRig 49 Midi keyboard