Hi @GaryLock-9707,
Welcome to Microsoft Q&A Platform. Thanks for posting the query.
Please check this document for memory limitations on Excel and possible alternatives to overcome this issue. 32-bit Excel have more limitations compared to 64bit and also 2016 version of the Excel has enhanced memory capabilities. In addition to this, please check if there are multiple excel documents opened which might consume more memory.
Please let us know for further queries and we will be glad to assist.
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