sounds like the OS on your device is force closing due to low memory or other multitasking issues. So lets continue the discussion here.
What have you done to try and troubleshoot?
how long has this been going on?
did you install or uninstall anything prior to this issue?
what is your memory status? phone/internal storage?
have you closed any unnecessary tabs in the browser?
what happens if you stream from , say, youtube? hiccups? or does it stream fine?
does this issue happen on wifi AS WELL AS cellular?