Annoying stick up cam

Hi, I bought a doorbell 2 a couple of months ago, after a few days of teething trouble i got that working fine, to date it still is fine.I then bought a stick up camera. ive had it a month. Ive never had it working consistanlty for more than a few days, regularly having to reset it. For example, yesterday morning it was working fine, detecting motion, that stopped around lunchtime. It hasnt worked since. Ive just reset it, still not working. Battery power is ok. I have a wifi extender just 5 feet from the camera, the RSI currently -40Im considering returning it to amazon as faulty, but wondering if anyone can help first. I had considered getting a few more of these cameras but if there this much hassle i'll probably try another brand.Dave