Vanishing e-mails

I have had a hotmail account for longer than I can remember and have always found it simple and easy to use. Since my account has been changed over my e-mails keep vanishing from my inbox. I have the account linked to a POP account and therefore do not log in daily or anything like that but it is certainty within your 270 day time frame and still my e-mails are gone but only from my hotmail account and not the pop account.

This is really annoying as I rely on my hotmail account e-mails when not at home with my POP linked computer and I am frequently discovering that the e-mail that I have logged on to find has gone. Looking at the threads I have noted that this seems to be a common problem for a number of users, yet nothing seems to have changed. 

If the situation is not resolved then I will be deleting my longstanding account as I am sick and tired of all my e-mails vanishing. I wish my old hotmail account settings could be re-stored as I never had any problems until I was moved over. Even my emails from April this year have been deleted and I can't recover them on my e-mail account. 

Why is this happening and can it be fixed? If my e-mails can't be restored/ no explanation given then I will be changing to a new account rather than continue to encounter the same problems time and time again. 

I look forward to your response.