The Arduino uno Takes 20 seconds to start

Using Arduino IDE 1.x
1

im Have a strange issue with my arduino Uno. it seems to work normally but 15 second in, it starts running really quickly. i set up a timer loop using milis and it runs once every 5 sesconds like it should but suddenly, it starts running 100 times+ a second. massive amount of prints occur.

i thought it was my code but i commented everything out. only loop variables and serial.begin();

whats odd is that if i do this in an empty sketch, its fine but if i use my sketch with everything commented out, this problem occur. Any ideas?
any by eveything commented out i do mean everything. not even global vars. everything except loop var and serial.begin().

i even went all out and deleted everything instead of commenting it out. still same. i Ended up copying the code to a new sketch, but nothing. any ideas?

loop(){

  MessTime=millis();
  
  if(MessTime-HoldTime>interval){
      HoldTime=MessTime;
 
      }

  }
2

That code will not tell you what is going on.

3

(deleted)

4

spycatcher2k:
Post a sketch that shows this - make it the smallest one you find show this behaviour.

its all good. the Problem was that i used int instead of unsigned longs. seems to work after changing that

5

But where you used int? Please, be more specific about your mistake. It can be helpful for other people.

6

This example demonstrates why you should always post full sketches too - as the problem is obvious from the full sketch, with variable declarations, but not visible in the snippet you posted.

7

Budvar10:
But where you used int? Please, be more specific about your mistake. It can be helpful for other people.

i defined MessTime,HoldTime and interval as global ints and they should be unsigned longs.