What does one mean when one says that it requires to monitor fund performance once in every 6 months and re-balance the portfolio? For example, let’s say, one stays iinvested in Fund A for a long period of about 5 years and the fund has been generating good returns until now. If that Fund A’s performance starts going downhill in the next 6 months even though the market is going uphill, should the investor sell all the units of Fund A and invest the proceeds in a top performing Fund B, which has been a top performer of the year or should the investor leave the units of Fund A as it is and stop further investments in it and start SIP of a top performing Fund B? Please clarify. Thanks.