diff --git a/slsDetectorGui/src/qDrawPlot.cpp b/slsDetectorGui/src/qDrawPlot.cpp
index d1a233731..8617c8206 100644
--- a/slsDetectorGui/src/qDrawPlot.cpp
+++ b/slsDetectorGui/src/qDrawPlot.cpp
@@ -193,6 +193,7 @@ void qDrawPlot::SetupPlots() {
     gainplot2d = new SlsQt2DPlot(boxPlot, true);
     gainplot2d->SetData(nPixelsX, -0.5, nPixelsX - 0.5, nPixelsY, -0.5,
                         nPixelsY - 0.5, gainData);
+    gainplot2d->Update();
     gainplot2d->hide();
     connect(plot2d, SIGNAL(PlotZoomedSignal(const QRectF &)), this,
             SLOT(Zoom2DGainPlot(const QRectF &)));
@@ -1009,6 +1010,7 @@ void qDrawPlot::Update2dPlot() {
     if (isGainDataExtracted) {
         gainplot2d->SetData(nPixelsX, -0.5, nPixelsX - 0.5, nPixelsY, -0.5,
                             nPixelsY - 0.5, gainData);
+        gainplot2d->Update();
         if (!gainplot2d->isVisible()) {
             gainplot2d->setFixedWidth(plot2d->width() /
                                       qDefs::DATA_GAIN_PLOT_RATIO);
diff --git a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
index fbe333f97..e7401f474 100644
--- a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
@@ -3323,6 +3323,27 @@ void *start_timer(void *arg) {
                 break;
             }
 
+            // change gain and data for every frame
+            {
+                const int nchannels = NCHIP * NCHAN;
+                int gainVal = 0;
+                for (int i = 0; i < nchannels; ++i) {
+                    if ((i % nchannels) < 400) {
+                        gainVal = 1 + frameNr;
+                    } else if ((i % nchannels) < 800) {
+                        gainVal = 2 + frameNr;
+                    } else {
+                        gainVal = 3 + frameNr;
+                    }
+                    int dataVal =
+                        *((uint16_t *)(imageData + i * sizeof(uint16_t)));
+                    dataVal += frameNr;
+                    int channelVal =
+                        (dataVal & ~GAIN_VAL_MSK) | (gainVal << GAIN_VAL_OFST);
+                    *((uint16_t *)(imageData + i * sizeof(uint16_t))) =
+                        (uint16_t)channelVal;
+                }
+            }
             // sleep for exposure time
             struct timespec begin, end;
             clock_gettime(CLOCK_REALTIME, &begin);
diff --git a/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
index 73379083d..0060ce55a 100644
--- a/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
@@ -2726,6 +2726,7 @@ void *start_timer(void *arg) {
             if (i % pixelsPerPacket == 0) {
                 ++dataVal;
             }
+
             if ((i % 1024) < 300) {
                 gainVal = 1;
             } else if ((i % 1024) < 600) {
@@ -2766,6 +2767,28 @@ void *start_timer(void *arg) {
             clock_gettime(CLOCK_REALTIME, &begin);
             usleep(expUs);
 
+            // change gain and data for every frame
+            {
+                const int npixels = (NCHAN * NCHIP);
+                for (int i = 0; i < npixels; ++i) {
+                    int gainVal = 0;
+                    if ((i % 1024) < 300) {
+                        gainVal = 1 + iframes;
+                    } else if ((i % 1024) < 600) {
+                        gainVal = 2 + iframes;
+                    } else {
+                        gainVal = 3 + iframes;
+                    }
+                    int dataVal =
+                        *((uint16_t *)(imageData + i * sizeof(uint16_t)));
+                    dataVal += iframes;
+                    int pixelVal =
+                        (dataVal & ~GAIN_VAL_MSK) | (gainVal << GAIN_VAL_OFST);
+                    *((uint16_t *)(imageData + i * sizeof(uint16_t))) =
+                        (uint16_t)pixelVal;
+                }
+            }
+
             int srcOffset = 0;
             int srcOffset2 = DATA_BYTES / 2;
             int row0 = (numInterfaces == 1 ? detPos[1] : detPos[3]);