diff --git a/ubb-la/ubb-la.c b/ubb-la/ubb-la.c
index dfa0a01..f94cb93 100644
--- a/ubb-la/ubb-la.c
+++ b/ubb-la/ubb-la.c
@@ -190,10 +190,19 @@ static void xfers(unsigned long *bufs, int n_bufs, int nibbles)
 	dma_setup(bufs[0], nibbles);
 
 	while (1) {
+		int j;
+
 		MSC_STRPCL = MSC_STRPCRL_START_OP;
 
+		/*
+		 * Experimental value for 12 MSa/s: hangs always/usually with
+		 * 231 cycles, hangs sometimes with 232, hands never (so far)
+		 * with 233.
+		 */
+		for (j = 0; j != 233; j++) asm volatile ("");
+
 //		while (MSC_STAT & MSC_STAT_DATA_FIFO_EMPTY);
-		while (!(MSC_STAT & MSC_STAT_END_CMD_RES));
+//		while (!(MSC_STAT & MSC_STAT_END_CMD_RES));
 
 		IN(UBB_CMD);