Hi @PedroPereira,
for me this situation looks like a networking problem. Maybe some devices are blocking SMARTPings or delaying them. Maybe your round trip time is also not the best, would fit your
Can you enable the normal ping check and take a look on your round trip times? Maybe in your case it’s a good idea to lower the check interval of these hosts completely. We also have some hosts at locations with bad connection an therefore we reduced the interval to 2 or 3 minutes and also set the round trip alert much higher (sometimes over 1.5 sec. for ICMP to return).
If you still like use the SMARTPing function i would recommend to drastically higher the values @andreas-doehler mentioned.