I've had two previous guinea pigs that got used to me on the day I got them, literally! They would let me pick them up, stroke them and hand feed them straight away! Recently, 5 weeks ago, I got two new guinea pigs. I don't understand, I've been handling them and interacting with them daily, they eat from my hand, they sometimes let me pat them while inside the cage and they don't bite me but the always run away, sometimes they won't let me pat them, they stay in their pigloo most of the time, and when I have them out for lap time they are basically frozen still. How do I get them to trust me more? And to become tame and get used to me?