Money flow is always mattered with any business, especially with e-commerce merchants. Keeping a Paypal account on good standing is very important to avoid many serious issues with your account such as reserve money, long time to withdraw, lose disputes, or account blocked.
Paypal may disable your account first then hold your income up to 180 days, it depends on the number of issues, disputes, or claims you get from the consumers. We enclosed a quote from Paypal below and also the link to Paypal Reserves TOS so you may find out more ideas
"Ship promptly and give your customers valid tracking information through PayPal, so they can keep tabs on their purchases and know when to expect delivery"