Originally Posted by 
JDNSW
				
			 
			Problems with fixed wireless seem to usually be because of inadequate bandwidth somewhere along the line. This may be due to the RSP buying insufficient bandwidth, but may also be due to insufficient backhaul from the tower by NBN or from excessive data use in your particular segment from the tower. This may be because NBN has allowed too many clients on that segment, or because one (or more) of these clients is using excessive data quantities. Worth noting that there are "fair use" data limits on wireless as well as satellite, but these appear to be totally ignored by both NBN and RSPs. 
The only one of these issues that you have any control over (by changing RSP) is if the RSP is buying insufficient bandwidth.