diff --git a/libs/main/io_devices/piethernet.cpp b/libs/main/io_devices/piethernet.cpp
index b4cc4711..060c52d5 100644
--- a/libs/main/io_devices/piethernet.cpp
+++ b/libs/main/io_devices/piethernet.cpp
@@ -714,10 +714,7 @@ ssize_t PIEthernet::readDevice(void * read_to, ssize_t max_size) {
 			PRIVATE->addr_.sin_len = sizeof(PRIVATE->addr_);
 #endif
 			//piCout << "connect to " << path() << "...";
-			bool was_block_read_flag = blockingReadFlag();
-			setBlockingReadFlag(true);
 			connected_ = (::connect(sock, (sockaddr * )&(PRIVATE->addr_), sizeof(PRIVATE->addr_)) == 0);
-			setBlockingReadFlag(was_block_read_flag);
 			//piCout << "connect to " << path() << connected_;
 			if (!connected_)
 				piCoutObj << "Can`t connect to" << addr_r << "," << ethErrorString();
diff --git a/libs/main/io_devices/piiodevice.cpp b/libs/main/io_devices/piiodevice.cpp
index dd8a7e46..32ff817f 100644
--- a/libs/main/io_devices/piiodevice.cpp
+++ b/libs/main/io_devices/piiodevice.cpp
@@ -341,16 +341,6 @@ PIIODevice * PIIODevice::newDeviceByPrefix(const char * prefix) {
 }
 
 
-bool PIIODevice::blockingReadFlag() const {
-	return reading_now;
-}
-
-
-void PIIODevice::setBlockingReadFlag(bool yes) {
-	reading_now = yes;
-}
-
-
 void PIIODevice::read_func() {
 	if (!isReadable()) {
 		read_thread.stop();
diff --git a/libs/main/io_devices/piiodevice.h b/libs/main/io_devices/piiodevice.h
index 0864514a..0102af80 100644
--- a/libs/main/io_devices/piiodevice.h
+++ b/libs/main/io_devices/piiodevice.h
@@ -528,15 +528,15 @@ protected:
 	virtual void threadedReadBufferSizeChanged() {;}
 
 	static PIIODevice * newDeviceByPrefix(const char * prefix);
-	bool blockingReadFlag() const;
-	void setBlockingReadFlag(bool yes);
 
-	
+	bool isThreadedReadStopping() const {return read_thread.isStopping();}
+
 	DeviceMode mode_;
 	DeviceOptions options_;
 	ReadRetFunc func_read = nullptr;
 	bool opened_ = false;
 	void * ret_data_ = nullptr;
+	std::atomic_bool reading_now;
 
 private:
 	EVENT_HANDLER(void, read_func);
@@ -554,7 +554,6 @@ private:
 	PIQueue<PIPair<PIByteArray, ullong> > write_queue;
 	ullong tri = 0;
 	uint threaded_read_buffer_size, reopen_timeout = 1000;
-	std::atomic_bool reading_now;
 	bool reopen_enabled = true;
 
 	static PIMutex nfp_mutex;
diff --git a/libs/main/io_devices/piserial.cpp b/libs/main/io_devices/piserial.cpp
index 644c90bf..d4b8d38d 100644
--- a/libs/main/io_devices/piserial.cpp
+++ b/libs/main/io_devices/piserial.cpp
@@ -680,7 +680,7 @@ bool PISerial::openDevice() {
 
 
 bool PISerial::closeDevice() {
-	if (isThreadedRead()) {
+	if (isThreadedRead() && !isThreadedReadStopping()) {
 		stopThreadedRead();
 	}
 	if (fd != -1) {