I was permanently limited for money laundering regulations on Sep 8 2014. My record was flawless with zero disputes.
After 45 days I was able to withdraw my funds, which was only $50 at the time.
This week I sent them a respectful email asking for my limit to be removed. I explained the large amount of small transactions as doing freelance graphic design works from small to big.
The next day all my info was stripped off the limited account and paypal granted me permission to start a new account with an apology.
Be very polite in any and all communication you have with paypal. Provide a logical explanation that makes whatever transactions you have look legit.
As for avoiding suspicions, ... Just be wary of who you deal with, chargebacks are very bad for your record.
Make sure your info is legit and verified. After a certain amount of money (€2500) received in one calendar year Paypal is forced to investigate your account to comply with money laundering and fraud regulations.