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LTC3260 slowly decreasing output voltage level


We draw  a few hundred uA from both LDO outputs of LTC3260. When we first power up we have [LDO-] fine but when we check [VOUT-] it is slighly lower (-4v8 instead of -5v0).

Over time [VOUT-] goes to -3v0 and [LDO-] becomes zero. If we power down and wait, we have the initial state again. Any ideas?