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4X20 LCD Display Problem

Hi, i am working on 4X20 LCD ....i wrote code for that this code is working but when trying to reset my board ...LCD displays Different characters and the position of character also changed so,PLz guide me why this problem happen...

LCD shows Like special Symbols and when ever i tried to reset my board at the time LCD shifts the position of Character but i am not applied the command for that position.....so, Why LCD changes position when i done reset Plz help me ....i tried lot of times but i didnt find solution....