// NOTE: connect 4.7k pull-down from GPIO15 to GND if your board or shield has level converters
// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, use different pin in case, or 4k7 pull-down
If you want to use the 4.2" e-paper display with deep sleep, you should use the bare e-paper panel with the connection board DESPI-C02 from Good Display: Connection adapter board HAT connect for e-Paper display DESPI-C02,Evaluation Kit,e-paper disp
The new boards from Waveshare with level converters are fine for use with 5V Arduinos, but cause a lot of problems when used with 3.3V processor boards.
Explanation, e.g. for the led glow effect: The level converter used is of the automatic bidirectional type. It poses a load on both sides to determine which is the driving side. It "pulls" toward a middle voltage. And this uses more current than all other components in deep sleep.