[ 529.311] WireSocketManager – Request ‘/user/keepalive’ Started RID 9326715B-616A-48FB-BBFC-350867330DF1
[ 529.409] WireSocketManager – Request ‘/user/keepalive’ Completed in 0.098s RID 9326715B-616A-48FB-BBFC-350867330DF1
[ 530.629] Setting 3rd side to monster 17, jarcannon
[ 530.630] Gui – EnterScreen [gui/screenfiles/monstercard/monstercard_ingame]
[ 530.630] Gui – Screen Focus GAINED [gui/screenfiles/monstercard/monstercard_ingame]
[ 532.975] Gui – ExitScreen [gui/screenfiles/monstercard/monstercard_ingame]
[ 533.224] Gui – Screen Focus LOST [gui/screenfiles/monstercard/monstercard_ingame]
[ 533.225] GuiManager::ProcessScreensMarkedForCleanup – mem used 444788736
[ 539.322] WireSocketManager – Request ‘/user/keepalive’ with requirement Authenticated Enqueued RID C20AB0DC-48FA-4E5E-8674-C8D1B2C32EA2
[ 539.322] WireSocketManager – Request ‘/user/keepalive’ Started RID C20AB0DC-48FA-4E5E-8674-C8D1B2C32EA2
[ 539.422] WireSocketManager – Request ‘/user/keepalive’ Completed in 0.100s RID C20AB0DC-48FA-4E5E-8674-C8D1B2C32EA2
[ 549.328] WireSocketManager – Request ‘/user/keepalive’ with requirement Authenticated Enqueued RID 115B3D7A-46A1-47B9-A071-652D105AC226
[ 549.329] WireSocketManager – Request ‘/user/keepalive’ Started RID 115B3D7A-46A1-47B9-A071-652D105AC226
[ 555.924] Setting 3rd side to monster 2, murderwing
[ 555.924] Gui – EnterScreen [gui/screenfiles/monstercard/monstercard_ingame]
[ 555.924] Gui – Screen Focus GAINED [gui/screenfiles/monstercard/monstercard_ingame]
[ 556.277] WireSocketManager – Request ‘/user/keepalive’ Completed in 6.949s RID 115B3D7A-46A1-47B9-A071-652D105AC226
[ 557.400] Gui – ExitScreen [gui/screenfiles/monstercard/monstercard_ingame]
[ 557.470] Inventory – Flushed 9 entries
[ 557.669] Gui – Screen Focus LOST [gui/screenfiles/monstercard/monstercard_ingame]
[ 557.670] GuiManager::ProcessScreensMarkedForCleanup – mem used 441794560
[ 558.267] Inventory – Flushed 28 entries
[ 559.340] WireSocketManager – Request ‘/user/keepalive’ with requirement Authenticated Enqueued RID FABAA1AA-8C87-4EB3-B54C-0F2E255CBC84
[ 559.340] WireSocketManager – Request ‘/user/keepalive’ Started RID FABAA1AA-8C87-4EB3-B54C-0F2E255CBC84
[ 559.441] WireSocketManager – Request ‘/user/keepalive’ Completed in 0.101s RID FABAA1AA-8C87-4EB3-B54C-0F2E255CBC84
[ 569.349] WireSocketManager – Request ‘/user/keepalive’ with requirement Authenticated Enqueued RID E6B1A414-CEA8-45D2-8FE9-35F96CFAAD06
[ 569.349] WireSocketManager – Request ‘/user/keepalive’ Started RID E6B1A414-CEA8-45D2-8FE9-35F96CFAAD06
[ 570.318] Inventory – Flushed 0 entries
[ 570.360] Gui – EnterScreen [gui/screenfiles/common/cmn_loading_screen]
[ 570.361] Gui – Screen Focus GAINED [gui/screenfiles/common/cmn_loading_screen]
[ 570.361] WireSocketManager – Request ‘/monster/postturndata?gameid=c3cf55b2-91b0-4a7c-b6d7-5c3148a89700’ with requirement Authenticated Enqueued RID 29E767C5-EF44-4F17-9949-B16AD803E1C3
[ 574.008] WireSocketManager – Request ‘/user/keepalive’ Completed in 4.659s RID E6B1A414-CEA8-45D2-8FE9-35F96CFAAD06
[ 574.009] WireSocketManager – Request ‘/monster/postturndata?gameid=c3cf55b2-91b0-4a7c-b6d7-5c3148a89700’ Started RID 29E767C5-EF44-4F17-9949-B16AD803E1C3
[ 588.161] WireSocket – Protocol error: Server Error
[ 588.161] WireSocketManager – Server Error: Server Error
[ 588.176] Gui – EnterScreen [gui/screenfiles/common/cmn_generic_dialog]
[ 588.176] Gui – Screen Focus LOST [gui/screenfiles/decorators/decorators_main]
[ 588.177] Gui – Screen Focus LOST [gui/screenfiles/hud_battle/hudbattle_main]
[ 588.177] Gui – Screen Focus LOST [gui/screenfiles/hud_battle/replay_main]
[ 588.177] Gui – Screen Focus LOST [gui/screenfiles/common/cmn_loading_screen]
[ 588.177] Gui – Screen Focus GAINED [gui/screenfiles/common/cmn_generic_dialog]
[ 588.196] Failed to post turn. Canceled promise
[ 588.197] Gui – ExitScreen [gui/screenfiles/common/cmn_loading_screen]
[ 588.490] GuiManager::ProcessScreensMarkedForCleanup – mem used 436498432
Hey there! Our team is already looking into this and are actively working to fix this issue right away! Sorry for the inconvenience!
— UPDATE —
Our devs have already identified the issue and have applied a fix. The server should be stable again. 
If the issue happens again please report them to us ASAP.