Heard he wrote a bunch of rambling thoughts near the end of his life and doubted his own theory of relativity...it was in Einstein: His Life and Universe by Walter Isaacson
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6$\begingroup$ Where have you heard it, and what exactly did Isaacson write? I looked through the last two chapters of his book, but did not find anything like that. $\endgroup$– ConifoldCommented May 29, 2019 at 21:28
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$\begingroup$ Maybe this refers to the "cosmological constant" ... which Einstein later called his "biggest blunder". $\endgroup$– Gerald EdgarCommented May 30, 2019 at 0:03
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1$\begingroup$ Hi, when asking questions, please replace "I've heard" with a citation link so we can evaluate the source $\endgroup$– Carl WitthoftCommented May 30, 2019 at 12:38
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$\begingroup$ @GeraldEdgar I doubt it. He renounced the cosmological constant from 1931 onward, not in the last years, and never returned to it, see Investigating the legend of Einstein’s “biggest blunder”. $\endgroup$– ConifoldCommented May 31, 2019 at 8:10
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No.
He opposed Quantum Mechanics from the beginning until death. He did it because its inherent non-determinism ("God does not gamble"). In his opinion, the cause of the non-determinism of the QM is that "it is not ready".
However, he worked on the further development of the GR until death. A possible direction was to describe also the electromagnetism as spacetime curvature. This makes highly unlikely that he had doubted it.
