我是 Google Assistant SDK 的新手。最近我在 Raspberry Pi 3 B 中嵌入了 Assistant。我使用了googlesamples-assistant-hotword示例。它工作得很好。但是下次我运行该命令时，我遇到了一些错误。我重新安装了sdk并尝试了，但得到了同样的错误。但是googlesamples-assistant-pushtotalk仍然有效。但是googlesamples-assistant-hotword给出了错误。我怎样才能解决这个问题。我得到的错误如下；
(env) pi@raspberrypi:~$ googlesamples-assistant-hotword
ON_MUTED_CHANGED:
{u'is_muted': False}
ON_START_FINISHED
E0922 08:01:19.189206804 9868 handshake.c:128] Security handshake failed: {"created":"@1506047479.189164282","description":"Handshake read failed","file":"../../third_party/grpc/src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1506047479.189160249","description":"FD shutdown","file":"../../third_party/grpc/src/core/lib/iomgr/ev_epoll_linux.c","file_line":1045}]}
E0922 08:01:20.189959242 9868 handshake.c:128] Security handshake failed: {"created":"@1506047480.189916251","description":"Handshake read failed","file":"../../third_party/grpc/src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1506047480.189911706","description":"FD shutdown","file":"../../third_party/grpc/src/core/lib/iomgr/ev_epoll_linux.c","file_line":1045}]}
E0922 08:01:21.190931499 9868 handshake.c:128] Security handshake failed: {"created":"@1506047481.190904069","description":"Handshake read failed","file":"../../third_party/grpc/src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1506047481.190900454","description":"FD shutdown","file":"../../third_party/grpc/src/core/lib/iomgr/ev_epoll_linux.c","file_line":1045}]}
[9782:9800:ERROR:speech_recognition_activity.cc(550)] S3 connection has timed out: No data from S3