Is there anything wrong with westhash or its my problem? I have a average speed of 850Mh/s but all of sudden my speed was reduced to 650 Mh/s with plenty of reject.

https://www.westhash.com/?p=miners&a=3&addr=12Luqz8jqCFCsCEDmUPhuwYrZfubwxoLhd

Thanks..