Why does my speed sensor and cadence sensor keep disconnecting and reconnecting?

Which type? If the combined unit try changing the battery and check the position of the magnets.

If the magnetless separate sensors, try changing the batteries.

Thanks for the reply Philip. I changed the battery on both units and there was no change. There are no magnets It's all bluetooth. I reset the default on the 530 plus. I haven't given it a try yet.