In late 2014, the battery frame in the ULXD1 was changed. Please provide details.
To improve the quality, reliability and durability of the ULXD1, Shure instituted a new battery frame design that was first employed with QLX-D. The new frame eliminates potential battery contact issues when using AA Alkaline cells.
Note that the SB900 rechargeable battery does not have contact issues.
To determine if a ULXD1 has the new frame, look for the label inside the battery compartment. Printed above the word "Mexico", there will be the letter "F" (for Frame).
When using AA cells with an older ULXD1 without the new frame, use the battery cradle accessory that was supplied with transmitter.