1) A crossed feeder issue occurs when the feeders connecting sectors at a cell site are incorrectly wired, such that the parameters of two sectors are reversed. 2) This can cause problems like greater interference, poor uplink signal strength, and reduced handover performance. 3) Drive testing can detect crossed feeders by identifying instances where a mobile receives signals that shouldn't be present in its current location or sector. Uplink signal statistics can also reveal crossed receive feeders.