My daughter just started using the dexcom two weeks ago. The first week was great. We had no problems what so ever. The second week has been a complete disaster. The weather here has been very humid this week. My daughter is the catcher for her softball team. We cannot get the sensors to stay on during her games. We are using an iv prep under the dexcom and then putting a tegaderm over it. This doesn't work because she sweats so badly that nothing sticks to her. Any suggestions would be greatly appreciated.