I have a Waterman Phileas, and I carry it around in my shirt pocket. I use it on average every couple of days. I have not had any problem with ink drying. At most, the first letter will have to be retouched, because the ink wasn't flowing. One thing you might try is laying the pen on its side when you are not using it. That might improve flow a little.
[COLOR="DarkSlateBlue"][SIZE="3"][FONT="Comic Sans MS"]Victor[/FONT][/SIZE][/COLOR]
[B]Razors:[/B] Merkur HD (34C)
[B]Brushes:[/B] Rooney 1/1 "Super Silvertip"
[B]Aftershaves:[/B] Nivea Extra Soothing Balm, Pinaud Clubman