You seem to be getting approximately 1500 CRC or superframe errors in a 15 minute period. Say 100 per minute. There are approximately 58 superframes a second or 3480 a minute. So approximately 3% of your downloaded data is corrupt and will be discarded. No problem for the sort of data which can be retransmitted. Probably not so good for viewing a video stream.
Sounds a high number of errors to me.