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LDC1314DIAL-EVM: Demoboard is working bad with 1-Degree Dial Demo Software V1.0.0, pointer-jumping on scale by self-warming of the chip?

Part Number: LDC1314DIAL-EVM

Tool/software:

By using a new LDC1314DIAL-EVM with 1-Degree Dial Demo Software V1.0.0, initially software and LDC1314DIAL-EVM is working fine, after 3-5 min. working, pointer begins to jumping on scale several degrees away by itselfl.
The reason of this seems to be self-heating of LDC1314DIAL-EVM. By warming the demoboard a few degrees, the pointer-jumping begins suddenly. By cooling down the demoboard, there is no more pointer-jumping.

Do I got a defective Demoboard, or is this pointer-jumping a softwarebug?