I uploaded a boot-image to my server, that might work around this issue.
Please test and give feedback.
It's not an optimal solution, but might bring the device back from deepsleep easier.
You can flash it through TWRP's "Install image".
If you use Magisk, you either have to reflash it from TWRP or patch the boot-image from MagiskManager before booting into TWRP.
The patched image will be in "/sdcard/MagiskManager/patched_boot.img".
To be sure you should make a backup before.
You can download the images from
my server: go to your device-folder and download it from the "20180606-boot.img"-folder.