Continued Error Readings. . .Please help this is getting pricey and annoying

Good afternoon
I am using the clear blue ovulation testing kit (not the advanced). I start testing day 10 (my cycles run 27-31 days) and throughout the process I consistently get an error read at least 4-5 times during the process. I am doing everything as stated in the instructions. It is very frustrating for many reasons, mainly being that I am using these to chart best time to conceive and on top of that the product is pricey and at this point I am waiting over 6 sticks a month on error reads. Please help!!!!