Hi had a look at the logs and found this:
17-7-22 16:40:28.2|Info|NzbSearchService|Searching 1 indexers for [The Big Bang Theory : S09E05]
17-7-22 16:40:29.3|Info|DownloadDecisionMaker|Processing 6 releases
17-7-22 16:40:33.7|Fatal|NzbDroneErrorPipeline|Request Failed. POST /api/release
[v2.0.0.4855] Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: O. Path ‘’, line 0, position 0.
at Newtonsoft.Json.JsonTextReader.ParseValue()
at Newtonsoft.Json.JsonTextReader.Read()
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(JsonReader reader, JsonContract contract, Boolean hasConverter)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
at NzbDrone.Common.Serializer.Json.Deserialize[T](String json) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Common\Serializer\Json.cs:line 37
at NzbDrone.Core.Download.Clients.QBittorrent.QBittorrentProxy.ProcessRequest[TResult](HttpRequestBuilder requestBuilder, QBittorrentSettings settings) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Core\Download\Clients\QBittorrent\QBittorrentProxy.cs:line 185
at NzbDrone.Core.Download.Clients.QBittorrent.QBittorrentProxy.AddTorrentFromUrl(String torrentUrl, QBittorrentSettings settings) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Core\Download\Clients\QBittorrent\QBittorrentProxy.cs:line 75
at NzbDrone.Core.Download.Clients.QBittorrent.QBittorrent.AddFromMagnetLink(RemoteEpisode remoteEpisode, String hash, String magnetLink) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Core\Download\Clients\QBittorrent\QBittorrent.cs:line 36
at NzbDrone.Core.Download.TorrentClientBase1.DownloadFromMagnetUrl(RemoteEpisode remoteEpisode, String magnetUrl) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Core\Download\TorrentClientBase.cs:line 213 at NzbDrone.Core.Download.TorrentClientBase
1.Download(RemoteEpisode remoteEpisode) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Core\Download\TorrentClientBase.cs:line 102
at NzbDrone.Core.Download.DownloadService.DownloadReport(RemoteEpisode remoteEpisode) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Core\Download\DownloadService.cs:line 69
at NzbDrone.Api.Indexers.ReleaseModule.DownloadRelease(ReleaseResource release) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Api\Indexers\ReleaseModule.cs:line 67
at NzbDrone.Api.Indexers.ReleaseModule.<.ctor>b__7_0(Object x) in M:\BuildAgent\work\b69c1fe19bfc2c38\src\NzbDrone.Api\Indexers\ReleaseModule.cs:line 46
at CallSite.Target(Closure , CallSite , Func`2 , Object )
at Nancy.Routing.Route.<>c__DisplayClass4.b__3(Object parameters, CancellationToken context)
Does this tell us anything?