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The CMOS Checksum is invalid

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Good day
I have a laptop that will not boot I have to remove the cmos battery for a min then put it back in and reboot then I get the message below and sometimes can press enter to boot into windows. Once there I have to change my date and Im ok until I shut off my laptop. I have tried to flash the bios with an update but still same problem. I was thinking of trying to replace the bios chip on the MB.
"The cmos checksum is invalid. The cmos will be reset to default configuration and will be rebooted. CMOS Reset (502)

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