Kobo Clara BW issues

Before I send my new Clara BW back, has anyone else noticed the following issues (note WiFi and Blutooth are off)

Unexpected battery issues, particularly rapid dropping of battery life once the battery level gets to around 50%.

Particular issues with dark mode, after coming out of dark mode the kobo experiences freezes that require a shut down and start up. After such a shutdown and startup then you are not taken back to where you were last reading but several pages before. Also after using dark mode the battery level can drop dramatically.