Hello! I have lately been having problems with collection with diamon. Yesterday he was fine. He was moving forward, on the bit, and collected. Today he was totally different. During warmup he was collecting fine with me, but as soon as we were doing more he wouldn't even get on the bit. My saddle and tack were all in place. Sometimes he's just so unpredictable with this. He defaintly knows how to collect, but gets lazy with it. Can anybody give me some tips!