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The design changes of the Baksan low-background TAU-1 and TAU-2 set-upsallowed to improve a sensitivity of Po-214 half-life (\tau) measurements up tothe 2.5 x 10^{-4} are described. Different possible sources of systematicerrors influencing on the $\tau$-value are studed. An annual variation ofPo-214 half-life time measurements with an amplitude of A=(6.9 \pm 3) x 10^{-4}and a phase of (\phi=93 \pm 10) days was found in a sequence of theweek-collected \tau-values obtained from the TAU-2 data sample with totalduration of 480 days. 24 hours' variation of the \tau-value measurements withan amplitude of A=(10.0 \pm 2.6) x 10^{-4} and phase of (\phi=1 \pm 0.5) hourswas found in a solar day 1 hour step \tau-value sequence formed from the samedata sample. It was found that the Po-214 half-life averaged at 480 days isequal to (163.45 \pm 0.04) mks.

Sources of the systematic errors in measurements of Po-214 decay half-life time variations at the Baksan deep underground experiments