If you're experiencing cutting the Ethernet connection problems when launching the DewesoftX or BSOD screen with APC_INDEX_MISMATCH and "win32kfull.sys" error follow this article to solve the problem. The problem may be also unique to the particular login while another login on the same PC is ok. 

This issue is related to the Windows 10 KB5000802, KB5000803, KB5000808 and other cumulative updates released on March 9 2021 proved seriously troublesome for devices using certain printer drivers. This issue is also in line with DewesoftX startup. 

Microsoft has come good on its promise of releasing a fix for BSOD issue caused by update KB5000802. It 17/03/2021 released a new out-of-band update KB5001567 for Windows 10 versions 20H2, 2004 with a fix for the BSOD error.

Find some official news on the following article. 

Windows 10 KB5001567 released to fix KB5000802 BSOD, printing issue 

Microsoft releases KB5001567 to fix Windows 10 BSOD issue caused by KB5000802