我是Google Assistant SDK的新手。最近我嵌入了Raspberry Pi 3 B助手。我使用了 googlesamples-assistant-hotword 样本。它工作正常。但是下次我运行命令时出现了一些错误。我重新安装了sdk并试过，但是得到了同样的错误。但是 googlesamples-assistant-pushtotalk 仍然有效。但 googlesamples-assistant-hotword 会出错。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