Why are these errors happening?

2020-06-07 11:05:43.594 [ERROR] GoogleDrive API : Google Drive : Upload AddContentFromCache Fail : Unable to write data to the transport connection: An existing connection was forcibly closed by the remote host.
2020-06-07 11:05:43.601 [ERROR] UPLOADFILE : UploadData Fail : Position 2214592512 Length 67108864 ChunkCount 32 Finished False Exception : {“WinErrorCode”:1237,“NotifyErrorCode”:204,“RaiException”:"",“Filename”:"/Ricks/That '70s Show/That '70s Show - 1/that.70s.show.s01e21.1080p.bluray.x264-filmhd/that.70s.show.s01e21.1080p.bluray.x264-filmhd.mkv",“SocketError”:“ConnectionReset”,“InnerException”:“An existing connection was forcibly closed by the remote host”,“WebResponseCode”:0,“HttpException”:“Upload AddContentFromCache Fail”,“HttpReferenceMessage”:“POSITION : 2214592512 : LENGTH : 67108864 : UPINFO.SIZE2344358079bytes 2214592512-2281701375/2344358079\n”}
2020-06-07 11:05:53.505 [WARN] WaitUploadPosition : UPLOAD WAIT TIMEOUT
2020-06-07 11:06:03.521 [WARN] WaitUploadPosition : UPLOAD WAIT TIMEOUT
2020-06-07 11:06:13.524 [WARN] WaitUploadPosition : UPLOAD WAIT TIMEOUT
2020-06-07 11:06:40.201 [INFO] SESSION LOGOFF : 3
2020-06-07 11:06:40.462 [INFO] SESSION LOGON : 1

2020-06-06 15:44:51.498 [ERROR] FILESYSTEM : Google Drive : Read Fail : Exception : {“WinErrorCode”:87,“NotifyErrorCode”:301,“RaiException”:“ReadFile : EndPosition too large”}
2020-06-06 15:44:51.838 [ERROR] GOOGLEDRIVEFILE FILE : /Ricks/Missions/Missions - 2/Missions.S02E09.Architects.720p.AMZN.WEB-DL.DDP2.0.H.264-playWEB.mkv : CacheFile Read Failed : {“WinErrorCode”:87,“NotifyErrorCode”:301,“RaiException”:“ReadFile : EndPosition too large”}
2020-06-06 15:44:51.838 [ERROR] FILESYSTEM : Google Drive : Read Fail : Exception : {“WinErrorCode”:87,“NotifyErrorCode”:301,“RaiException”:“ReadFile : EndPosition too large”}
2020-06-06 15:44:51.838 [ERROR] GOOGLEDRIVEFILE FILE : /Ricks/Missions/Missions - 2/Missions.S02E09.Architects.720p.AMZN.WEB-DL.DDP2.0.H.264-playWEB.mkv : CacheFile Read Failed :

2020-06-05 02:34:51.763 [ERROR] Refresh Token Failed : The remote server returned an error: (504) Gateway Timeout.
2020-06-05 02:35:12.364 [ERROR] Refresh Token Failed : The remote server returned an error: (504) Gateway Timeout.
2020-06-05 02:35:22.991 [ERROR] Refresh Token Failed : The remote server returned an error: (502) Bad Gateway.
2020-06-05 02:35:33.498 [ERROR] Refresh Token Failed : The remote server returned an error: (502) Bad Gateway.
2020-06-05 02:35:54.078 [ERROR] Refresh Token Failed : The remote server returned an error: (504) Gateway Timeout.
2020-06-05 02:36:07.697 [ERROR] Refresh Token Failed : The remote server returned an error: (502) Bad Gateway.
2020-06-05 02:36:28.225 [ERROR] Refresh Token Failed : The remote server returned an error: (504) Gateway Timeout.
2020-06-05 02:36:29.433 [WARN] LICENSE SESSION Connect Closed : The remote party closed the WebSocket connection without completing the close handshake.
2020-06-05 02:36:29.449 [INFO] LICENSE SESSION Connect Closed. Restart

This means that Google Drive force to disconnect and then the rest of all task was canceled.

In this case, you had better resign into RaiDrive.
This message is caused when your own token was expired.

While uploading or caching, if the read(download) operation gets started, it could make this issue.