Havent seen anything recent to these issues but im running synolgy (latest version)
Sonarr has been great till a few days ago when i moved house (box been offline for a week)
here is error log
18-6-5 00:20:47.1|Warn|Newznab|Unable to connect to indexer
[v2.0.0.5085] System.Net.WebException: DNS Name Resolution Failure: ‘api.nzbgeek.info’
at NzbDrone.Common.Http.Dispatchers.ManagedHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x0015e] in <28afedda32c5499dab128da6b50bbb86>:0
at NzbDrone.Common.Http.Dispatchers.FallbackHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x0003c] in <28afedda32c5499dab128da6b50bbb86>:0
at NzbDrone.Common.Http.HttpClient.ExecuteRequest (NzbDrone.Common.Http.HttpRequest request) [0x0007e] in <28afedda32c5499dab128da6b50bbb86>:0
at NzbDrone.Common.Http.HttpClient.Execute (NzbDrone.Common.Http.HttpRequest request) [0x00000] in <28afedda32c5499dab128da6b50bbb86>:0
at NzbDrone.Common.Http.HttpClient.Get (NzbDrone.Common.Http.HttpRequest request) [0x00007] in <28afedda32c5499dab128da6b50bbb86>:0
at NzbDrone.Core.Indexers.Newznab.NewznabCapabilitiesProvider.FetchCapabilities (NzbDrone.Core.Indexers.Newznab.NewznabSettings indexerSettings) [0x0009a] in :0
at NzbDrone.Core.Indexers.Newznab.NewznabCapabilitiesProvider+<>c__DisplayClass4_0.b__0 () [0x00000] in :0
at NzbDrone.Common.Cache.Cached1[T].Get (System.String key, System.Func
1[TResult] function, System.Nullable1[T] lifeTime) [0x0006a] in <28afedda32c5499dab128da6b50bbb86>:0 at NzbDrone.Core.Indexers.Newznab.NewznabCapabilitiesProvider.GetCapabilities (NzbDrone.Core.Indexers.Newznab.NewznabSettings indexerSettings) [0x00046] in <ab54b7a85b364e7591653180d377c256>:0 at NzbDrone.Core.Indexers.Newznab.Newznab.get_PageSize () [0x0000c] in <ab54b7a85b364e7591653180d377c256>:0 at NzbDrone.Core.Indexers.Newznab.Newznab.GetRequestGenerator () [0x0000b] in <ab54b7a85b364e7591653180d377c256>:0 at NzbDrone.Core.Indexers.HttpIndexerBase
1[TSettings].TestConnection () [0x00007] in :0