diff --git a/src/p_inter.c b/src/p_inter.c
index d8765e7a2..82169bc54 100644
--- a/src/p_inter.c
+++ b/src/p_inter.c
@@ -2530,8 +2530,14 @@ void P_KillMobj(mobj_t *target, mobj_t *inflictor, mobj_t *source, UINT8 damaget
 		{
 			P_SetTarget(&target->target, source);
 			source->player->numboxes++;
-			if (cv_itemrespawn.value && gametype != GT_COOP && (modifiedgame || netgame || multiplayer))
-				target->fuse = cv_itemrespawntime.value*TICRATE + 2; // Random box generation
+			// Set respawn
+			if (!(target->flags2 & MF2_DONTRESPAWN))
+			{
+				if (!(netgame || multiplayer))
+					target->fuse = atoi(cv_itemrespawntime.defaultvalue)*TICRATE + 2; 
+				else if (cv_itemrespawn.value)
+					target->fuse = cv_itemrespawntime.value*TICRATE + 2;
+			}
 		}
 
 		// Award Score Tails
diff --git a/src/p_mobj.c b/src/p_mobj.c
index 6035a19ab..8cb53bd61 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -10063,9 +10063,10 @@ static void P_MonitorFuseThink(mobj_t *mobj)
 {
 	mobj_t *newmobj;
 
-	// Special case for ALL monitors.
+	// Special case for ALL monitors outside of co-op.
 	// If a box's speed is nonzero, it's allowed to respawn as a WRM/SRM.
-	if (mobj->info->speed != 0 && (mobj->flags2 & (MF2_AMBUSH|MF2_STRONGBOX)))
+	if (!G_CoopGametype() && mobj->info->speed != 0
+		&& (mobj->flags2 & (MF2_AMBUSH|MF2_STRONGBOX)))
 	{
 		mobjtype_t spawnchance[64];
 		INT32 numchoices = 0, i = 0;
@@ -10855,11 +10856,20 @@ mobj_t *P_SpawnMobj(fixed_t x, fixed_t y, fixed_t z, mobjtype_t type, ...)
 
 	// Set shadowscale here, before spawn hook so that Lua can change it
 	mobj->shadowscale = P_DefaultMobjShadowScale(mobj);
+	
+	// A monitor can't respawn if we're not in multiplayer,
+	// or if we're in co-op and it's score or a 1up
+	if (mobj->flags & MF_MONITOR && (!(netgame || multiplayer)
+	|| (G_CoopGametype()
+		&& (mobj->type == MT_1UP_BOX
+		|| mobj->type == MT_SCORE1K_BOX
+		|| mobj->type == MT_SCORE10K_BOX)
+	)))
+		mobj->flags2 |= MF2_DONTRESPAWN;
 
 	if (!(mobj->flags & MF_NOTHINK))
 		P_AddThinker(THINK_MOBJ, &mobj->thinker);
 
-
 	if (type == MT_PLAYER)
 	{
 		// when spawning MT_PLAYER, set mobj->player before calling MobjSpawn hook to prevent P_RemoveMobj from succeeding on player mobj.