After the 10.3.1 OTA update on the OnePlus 6 and 6T phones, users have reported multiple issues. Those include screen crashes and lag issues.
A user reported the problem in a detailed format on the OnePlus Community Forum. He mentioned that after updating to the said version, his device went through a few issues. You can check out the screenshot below.
It seems that the Chinese manufacturer can solve the hordes of issues with a following update.