Crash trying to debug wirelessly

I have no idea what changed. I started up my machines today and when I try and deploy wirelessly I get this crash output:

Application bundle 'com.myapp' installed on 'RealPhone's 6S'
Launching...
2018-03-20 21:27:22.756 mlaunch[5582:4452104] Threadpool worker DVTAssertions: Warning in /Library/Caches/com.apple.xbs/Sources/DVTiOSFrameworks/DVTiOSFrameworks-13760/DTDeviceKitBase/DTDKRemoteDeviceConnection.mm:968
Details: Failed to start Instruments daemon on device “c92f65c8ad6d40acf4dd10226b61e4890ce46d4c”: Error Domain=com.apple.dtdevicekit Code=-402653083 "Could not connect to the device." UserInfo={NSLocalizedDescription=Could not connect to the device., com.apple.dtdevicekit.stacktrace=(
0 DTDeviceKitBase 0x000000010dd68fed DTDKCreateNSError + 113
1 DTDeviceKitBase 0x000000010dd69831 DTDK_AMDErrorToNSError + 1135
2 DTDeviceKitBase 0x000000010dd7ae8f __63-[DTDKRemoteDeviceConnection startFirstServiceOf:unlockKeybag:]_block_invoke + 300
3 DTDeviceKitBase 0x000000010dd7a521 __48-[DTDKRemoteDeviceConnection futureWithSession:]_block_invoke_3 + 22
4 DTDeviceKitBase 0x000000010dd6b815 __DTDKExecuteInSession_block_invoke_2 + 35
5 DTDeviceKitBase 0x000000010dd6ac1f __DTDKExecuteWithConnection_block_invoke_2 + 474
6 DTDeviceKitBase 0x000000010dd6aa1a __DTDKExecuteWithConnection_block_invoke + 111
7 libdispatch.dylib 0x00007fff622fcd50 _dispatch_client_callout + 8
8 libdispatch.dylib 0x00007fff62313781 _dispatch_sync_invoke_and_complete_recurse + 65
9 libdispatch.dylib 0x00007fff6231321a _dispatch_sync_wait + 585
10 DVTFoundation 0x000000010c9376f0 DVTDispatchBarrierSync + 213
11 DVTFoundation 0x000000010c910c7a -[DVTDispatchLock performLockedBlock:] + 75
12 DTDeviceKitBase 0x000000010dd6a915 DTDKExecuteWithConnection + 231
13 DTDeviceKitBase 0x000000010dd6b681 DTDKExecuteInSession + 381
14 DTDeviceKitBase 0x000000010dd7a458 __48-[DTDKRemoteDeviceConnection futureWithSession:]_block_invoke_2 + 119
15 DVTFoundation 0x000000010c936a4f __DVTDispatchAsync_block_invoke + 806
16 libdispatch.dylib 0x00007fff62304591 _dispatch_call_block_and_release + 12
17 libdispatch.dylib 0x00007fff622fcd50 _dispatch_client_callout + 8
18 libdispatch.dylib 0x00007fff6231120c _dispatch_queue_serial_drain + 635
19 libdispatch.dylib 0x00007fff623040fd _dispatch_queue_invoke + 373
20 libdispatch.dylib 0x00007fff62311f02 _dispatch_root_queue_drain_deferred_wlh + 332
21 libdispatch.dylib 0x00007fff62315d16 _dispatch_workloop_worker_thread + 880
22 libsystem_pthread.dylib 0x00007fff625c1033 _pthread_wqthread + 980
23 libsystem_pthread.dylib 0x00007fff625c0c4d start_wqthread + 13
), NSLocalizedRecoverySuggestion=Could not connect to the device., NSLocalizedFailureReason=Could not connect to the device.}
Object:
Method: -instrumentsConnection
Thread: {number = 11, name = (null)}
Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide.
warning MT1043: Failed to launch the application using the instruments service. Will try launching the app using gdb service.
Launching 'com.myapp' on the device 'RealPhone's 6S'
Launching /private/var/containers/Bundle/Application/5F381836-A11F-4954-A187-DCFD18B12BC5/myapp.app -monodevelop-port 10000 -connection-mode wifi

If you leave it at this point nothing happens. Eventually the debugger detaches and nothing runs. Luckily things seem to work over USB.