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We study the mechanism of instability in transition edge sensor (TES)bolometers used for ground based observations of the Cosmic MicrowaveBackground (CMB) at 270GHz. The instability limits the range of usefuloperating resistances of the TES down to $\approx$ 50% of $R_n$, and due tovariations in detector properties and optical loading within a column ofmultiplexed detectors, limits the effective on sky yield. Using measurements ofthe electrical impedance of the detectors, we show the instability is due tothe increased bolometer leg $G$ for higher-frequency detection inducingdecoupling of the palladium-gold heat capacity from the thermistor. Wedemonstrate experimentally that the limiting thermal resistance is due to thesmall cross sectional area of the silicon nitride bolometer island, and so iseasily fixed by layering palladium-gold over an oxide protected TES. Theresulting detectors can be biased down to a resistance $\approx$10% of $R_n$.

Characterization and Improvement of the Thermal Stability of TES Bolometers