Low rising voltage issue with solar panel and capacitor

Hi everyone. I faced with some issue. My device has power source. This source is solar panel and capacitor. Device should work after sunrise only. Sometimes in the morning when sun start to rise nrf52840 even after rising voltage to 3.6V is not workable. I guess It happends because of low rising voltage. I tried to connect it to jlink but catch error "check connection". Even harware reset via p0.18 didn`t help. Only discharging of capacitor and start again. Help me please. How to pass this "voltage hole"

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