As the topic says, is there any limitation in the number of I-20 forms a F-1 student can have? 
I have 3 so far.
- Firs one - when I got admitted to university
- second - when I went home last summer
- Third - got CPT approved I-20 yesterday because I'm doing an internship this summer

I'm planning to go home next year's summer, that'll make the number 4.
i still have 2 more years at school. Is having many I-20s bad? 

Thanks!